1.What is steel boiler plate?
Boiler steel plates mainly refer to hot-rolled medium-thick plate materials used to manufacture superheaters, main steam pipes and boiler firebox heating surfaces. Boiler steel plate is one of the most critical materials in boiler manufacturing. It mainly refers to hot-rolled special carbon steel and low alloy used to manufacture important components such as pot shells, drums, header covers, supports and hangers in boilers. Heat-resistant steel medium-thick steel plate material.
2.Boiler steel plate material
The main materials of boiler steel include high-quality structural steel and low-alloy heat-resistant steel. Commonly used boiler steels include low-carbon killed steel smelted by open-hearth furnaces or low-carbon steel smelted by electric furnaces. The carbon content Wc is in the range of 0.16%-0.26%. Since the boiler steel plate works under medium temperature (below 350ºC) and high pressure, in addition to bearing high pressure, it is also subject to impact, fatigue load and water and gas corrosion. The performance requirements for boiler steel are mainly good welding and cold bending properties. Certain high temperature strength and resistance to alkali corrosion, oxidation, etc. Boiler steel plates generally work under medium-high temperature and high pressure. In addition to withstanding high temperatures and pressures, they are also subject to impact fatigue loads and water and gas corrosion. The working conditions are poor. Therefore, boiler steel plates must have good physical properties, mechanical properties and durability. Processability to ensure the safety of equipment use.
3. Classification of boiler steel plates
In terms of materials, boiler steel plates can be divided into two categories: special carbon steel plates and low alloy heat-resistant steel plates. The materials used in boiler steel plates have strict control over their chemical composition, especially harmful elements such as phosphorus and sulfur and residual elements such as chromium, nickel and copper. Good deoxidation and removal of non-metallic inclusions should also be carried out during smelting to ensure good Plasticity and toughness; the microstructure is required to be uniform, and the grain size is controlled within a certain range (usually the grain size is expected to be between 3 and 7); there are also strict requirements for surface quality and internal defects; in addition, mechanical properties at room temperature and high temperature Must guarantee.
It varies according to working conditions. Boiler steel plates can be divided into two categories: steel plates for manufacturing room-temperature and medium-temperature pressure-bearing parts and steel plates for manufacturing high-temperature pressure-bearing parts.
Carbon Steel Boiler and Pressure Vessel Plate
| Steel Standard | Carbon steel Plate Grades | ||
|---|---|---|---|
| ASTM A285 | Grade A | Grade B | Grade C |
| ASTM A299 | Grade A | Grade B | |
| ASTM A515 | Grade 60 | Grade 65 | Grade 70 |
| ASTM A516 | Grade 60 | Grade 65 | Grade 70 |
| ASTM A537 | Class 1 | Class 2 | Class 3 |
| ASTM A662 | Grade A | Grade B | Grade C |
| ASTM A738 | Grade A | Grade B | Grade C |
| BS 1501:430 | 161-360A/B | 161-430A/B | 223-490A/B |
| 224-460A/B | 224–490A/B | 225-490A/B | |
| DIN 1629 | St37.0 | St44.0 | St52.0 |
ASTM A285: Covers carbon steel plates of low- and intermediate-tensile strengths which may be made by killed, semi-killed, capped, or rimmed steel. These plates are intended for fusion-welded pressure vessels.
ASTM A299: Manganese-silicon carbon steel plates for use in welded boilers and other pressure vessels.
ASTM A515: Carbon-silicon steel plates primarily for intermediate- and higher-temperature service in welded boilers and other pressure vessels.
ASTM A516: Carbon steel plates intended primarily for service in welded pressure vessels where improved notch toughness is important.
ASTM A537: Heat-treated carbon manganese-silicon steel plates intended for fusion welded pressure vessels and structures.
ASTM A662: Carbon-manganese-silicon steel plates intended primarily for service in welded pressure vessels where improved low temperature notch toughness is important.
ASTM A738: Heat-treated carbon-manganese-silicon steel plates intended for use in welded pressure vessels at moderate and lower temperature service.
BS 1501:430: British Standard specification for carbon and carbon manganese steel plates for pressure purposes
DIN 1629: Steel pipes for pressure and thermal purposes with specified room temperature properties – line pipes.
Carbon Steel Boiler and Heat Exchanger Tube
| Steel Standard | Carbon steel Plate Grades | ||
|---|---|---|---|
| ASTM A179 | A179 | ||
| ASTM A106 | Grade A | Grade B | Grade C |
| ASTM A192 | A192 | ||
| ASTM A210 | A-1 | C | |
| JIS G3461 | STB340 | STB410 | STB510 |
ASTM A179: Minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. Tubes shall be made by the seamless process and shall be cold drawn.
ASTM A106: Carbon steel pipe for high-temperature service. These pipes are suitable for welding, bending, flanging, and similar forming operations. Mechanical testing of the specimens shall include tensile, bending, flattening, hydrostatic and nondestructive electric tests.
ASTM A192: Specifications for minimum-wall-thickness, seamless carbon steel boiler and superheater tubes for high-pressure service.
ASTM A210: Minimum-wall-thickness, seamless medium-carbon steel, boiler tubes and boiler flues, including safe ends, arch and stay tubes, and superheater tubes.
JIS G3461: Carbon steel tube used for exchanger heat on inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc. of the boiler, and heat exchanger tubes, condenser tubes, catalyser tubes, etc. used in chemical and petroleum industries.
1.GNEE EN10028-2 P250GH, 1.0460 - boiler steel
Low-alloy bioler carbon steel bars P250GH, C22.8, 1.0460 for operation at elevated temperatures for pressure equipment according to EN 10273, DIN 17243.
| Standard | Steel Grade | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | Nb: | Ti: | Alc: | Cu: | N: | |
| EN | P250GH - P 250 GH - 1.0460 | |||||||||||||
| 0.18 - 0.23 | 0.3 - 0.9 | <0.4 | <0.025 | <0.015 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| DIN | C22.8 - C 22.8 - C22G2 - C 22 G 2 | |||||||||||||
| 0.18 - 0.23 | 0.3 - 0.9 | <0.4 | <0.025 | <0.015 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| EN | P265GH - P 265 GH - 1.0425 | |||||||||||||
| <0.2 | 0.5 - 1.4 | <0.4 | <0.030 | <0.025 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| PN | St36K | |||||||||||||
| 0.08 - 0.16 | >0.4 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
| PN | St41K | |||||||||||||
| 0.12 - 0.20 | >0.45 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
| PN | St44K | |||||||||||||
| 0.14 - 0.22 | >0.55 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
P250GH, C22.8, 1.0460 - application
Boiler steel designed to operate at elevated temperature for many parts and subassemblies of pressure equipment operating up to 450 ℃, such as parts of pressure vessels, bolts, nuts, flanges, pipe joints and other power installations. P250GH is a grade in which mainly hot-rolled rods are supplied in the normalized state.
Mechanical properties of P250GH, C22.8, 1.0460 +N
Dimensions < 50mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp,02 > 250 MPa
Elongation, A > 25%
Dimensions 50 - 100mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp0,2 > 240 MPa
Elongation, A > 25%
Dimensions 100 - 150mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp0,2 > 230 MPa
Elongation, A > 25%
Impact energy, KV20℃ > 47 J
Mechanical properties at individual operating temperatures:
| The yield point Rp0,2 (MPa) | Temperature | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 50℃ | 100℃ | 150℃ | 200℃ | 250℃ | 300℃ | 350℃ | 400℃ | 450℃ | |
| Dimensions <50mm | >242 | >237 | >216 | >190 | >170 | >150 | >130 | >110 | >90 |
| Dimensions 50 - 100mm | >234 | >230 | >210 | >185 | >165 | >145 | >125 | >100 | >80 |
| Dimensions 100 - 150mm | >224 | >220 | >200 | >175 | >155 | >135 | >115 | >90 | >70 |
2.GNEE P250GH, 1.0460 - boiler steel
Low-alloy bioler carbon steel bars P250GH, C22.8, 1.0460 for operation at elevated temperatures for pressure equipment according to EN 10273, DIN 17243.
| Standard | Steel Grade | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | Nb: | Ti: | Alc: | Cu: | N: | |
| EN | P250GH - P 250 GH - 1.0460 | |||||||||||||
| 0.18 - 0.23 | 0.3 - 0.9 | <0.4 | <0.025 | <0.015 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| DIN | C22.8 - C 22.8 - C22G2 - C 22 G 2 | |||||||||||||
| 0.18 - 0.23 | 0.3 - 0.9 | <0.4 | <0.025 | <0.015 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| EN | P265GH - P 265 GH - 1.0425 | |||||||||||||
| <0.2 | 0.5 - 1.4 | <0.4 | <0.030 | <0.025 | <0.3 | <0.3 | <0.08 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| PN | St36K | |||||||||||||
| 0.08 - 0.16 | >0.4 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
| PN | St41K | |||||||||||||
| 0.12 - 0.20 | >0.45 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
| PN | St44K | |||||||||||||
| 0.14 - 0.22 | >0.55 | 0.15 - 0.35 | <0.045 | <0.045 | <0.3 | <0.3 | - | - | - | - | - | <0.3 | - | |
P250GH, C22.8, 1.0460 - application
Boiler steel designed to operate at elevated temperature for many parts and subassemblies of pressure equipment operating up to 450 ℃, such as parts of pressure vessels, bolts, nuts, flanges, pipe joints and other power installations. P250GH is a grade in which mainly hot-rolled rods are supplied in the normalized state.
Mechanical properties of P250GH, C22.8, 1.0460 +N
Dimensions < 50mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp,02 > 250 MPa
Elongation, A > 25%
Dimensions 50 - 100mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp0,2 > 240 MPa
Elongation, A > 25%
Dimensions 100 - 150mmTensile strength, Rm: 410 - 540 MPa
The yield point, Rp0,2 > 230 MPa
Elongation, A > 25%
Impact energy, KV20℃ > 47 J
Mechanical properties at individual operating temperatures:
| The yield point Rp0,2 (MPa) | Temperature | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 50℃ | 100℃ | 150℃ | 200℃ | 250℃ | 300℃ | 350℃ | 400℃ | 450℃ | |
| Dimensions <50mm | >242 | >237 | >216 | >190 | >170 | >150 | >130 | >110 | >90 |
| Dimensions 50 - 100mm | >234 | >230 | >210 | >185 | >165 | >145 | >125 | >100 | >80 |
| Dimensions 100 - 150mm | >224 | >220 | >200 | >175 | >155 | >135 | >115 | >90 | >70 |
Heat treatment of P250GH steel
Normalizing at 890 - 950 ℃
Relief annealing at a temperature of 520 - 580℃
3.GNEE P295GH, 1.0481 - boiler steel
Boiler steel P295GH+N, 1.0481 adapted to work in elevated temperatures in pressure equipment according to EN 10028-2, EN 10273.
| Standard | Steel Grade | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | V: | Nb: | Ti: | Al: | Cu: | N: | |
| EN | P295GH - 1.0481 | |||||||||||||
| 0.08 - 0.20 | 0.9 - 1.5 | <0.4 | <0.025 | <0.015 | <0.3 | <0.08 | <0.3 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 | |
| ISO | P290 | |||||||||||||
| <0.2 | 0.9 - 1.5 | <0.4 | <0.035 | <0.030 | <0.3 | <0.08 | <0.3 | - | - | - | >0.02 | <0.3 | - | |
P295GH, 1.0481 - specifications and application
Steel intended for elements of pressure equipment and power installations operating at elevated temperatures and pressures. The materials are delivered in the normalized condition +N.
Mechanical properties of P295GH, 1.0481 +N
Dimensions <16mmTensile strength, Rm: 460 - 580 MPa
The yield point, Rp0,2: >295 MPa
Elongation, A:> 21%
Dimensions 16 - 40mmTensile strength, Rm: 460 - 580 MPa
The yield point, Rp0,2: >290 MPa
Elongation, A:> 21%
Dimensions 40 - 60mmTensile strength, Rm: 460 - 580 MPa
The yield point, Rp0,2: >285 MPa
Elongation, A:> 21%
Dimensions 60 - 100mmTensile strength, Rm: 460 - 580 MPa
The yield point, Rp0,2: >260 MPa
Elongation, A:> 21%
Dimensions 100 - 150mmTensile strength, Rm: 440 - 570 MPa
The yield point, Rp0,2: >235 MPa
Elongation, A:> 21%
Dimensions 150 - 250mmTensile strength, Rm: 430 - 570 MPa
The yield point, Rp0,2: >220 MPa
Elongation, A:> 21%
Impact resistance, KV20℃ >40 J
Impact resistance, KV0℃ >34 J
Impact resistance, KV-20℃ >27 J
Properties at elevated temperatures of P295GH, 1.0481
| The yield point Rp0.2 (MPa) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Temperature (℃) | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 |
| <16mm | >285 | >268 | >249 | >228 | >209 | >192 | >178 | >167 |
| 16 - 40mm | >280 | >264 | >244 | >225 | >206 | >189 | >175 | >165 |
| 40 - 60mm | >276 | >259 | >240 | >221 | >202 | >186 | >172 | >162 |
| 60 - 100mm | >251 | >237 | >219 | >201 | >184 | >170 | >157 | >148 |
| 100 - 150mm | >227 | >214 | >198 | >182 | >167 | >153 | >142 | >133 |
| >150mm | >213 | >200 | >185 | >170 | >156 | >144 | >133 | >125 |
| Temperature (℃) | 380 | 400 | 420 | 440 | 460 | 480 | 500 |
|---|---|---|---|---|---|---|---|
| Creep limit, R1/100000 (MPa) | 153 | 118 | 92 | 69 | 51 | 38 | 29 |
| Creep strength, Rz/100000 (MPa) | 227 | 179 | 136 | 100 | 73 | 55 | 41 |
Heat treatment
Normalizing annealing at temperatures of 890 - 950℃
Relief annealing at a temperatures of 520 - 580℃
4.GNEE 16Mo3, 1.5415, 15Mo3 - boiler steel
Low-alloy boiler steel 16Mo3, 16M, 15Mo3, 1.5415 according to PN-75/H-84024, DIN 17243, EN 10273, EN 10222-2.
| Standard | Steel Grade | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | Cu: | Al: | N: | |||
| EN/DIN | 16Mo3 - 15Mo3 - 1.5415 | ||||||||||||
| 0.12 - 0.20 | 0.4 - 0.9 | <0.35 | <0.025 | <0.010 | <0.3 | 0.25 - 0.35 | <0.3 | <0.3 | - | <0.012 | |||
| PN | 16M | ||||||||||||
| 0.12 - 0.20 | 0.5 - 0.8 | 0.15 - 0.35 | <0.040 | <0.040 | <0.3 | 0.25 - 0.35 | <0.35 | <0.25 | <0.012 | - | |||
| EN | 17Mo3 | ||||||||||||
| 0.12 - 0.22 | 0.4 - 0.9 | <0.4 | <0.025 | <0.015 | - | 0.25 - 0.35 | - | - | - | - | |||
| NF | 15D3 | ||||||||||||
| <0.18 | 0.5 - 0.8 | 0.15 - 0.35 | <0.035 | <0.030 | <0.3 | 0.25 - 0.35 | - | - | - | - | |||
16Mo3, 1.5415 - specifications and application
16Mo3 steel is used in the production of furnaces, parts of steam boilers, pressure vessels, heat exchangers, collective chambers, chemical equipment parts, hot gas distributors, bolts, flanges, nuts, coils, collectors and other energy equipment. Weldable grade.
Mechanical properties of 16Mo3, 1.5415 according to EN 10273
Dimensions <16mmTensile strength, Rm: 440 - 590 MPa
The yield point, Rp0.2 >275 MPa
Elongation, A > 24%
Dimensions 16-40mmTensile strength, Rm: 440 - 590 MPa
The yield point, Rp0,2 >270 MPa
Elongation, A > 24%
Dimensions 40-60mmTensile strength, Rm: 440 - 590 MPa
The yield point, Rp0,2 >260 MPa
Elongation, A > 23%
Dimensions 60-100mmTensile strength, Rm: 430 - 580 MPa
The yield point, Rp0,2 >240 MPa
Elongation, A > 22%
Dimensions 100-150mmTensile strength, Rm: 420 - 570 MPa
The yield point, Rp0,2 >220 MPa
Elongation, A > 19%
Impact energy, KV20℃ >40 J
Strength properties at elevated temperatures of 16Mo3, 1.5415
| Temperature (℃) | 200 | 250 | 300 | 350 | 400 | 450 | 500 |
|---|---|---|---|---|---|---|---|
| The yield point Rp0.2 (MPa) | 215 | 200 | 170 | 160 | 150 | 145 | 140 |
| Temperature (℃) | 450 | 470 | 490 | 510 | 530 |
|---|---|---|---|---|---|
| Creep strength, Rz/100000 (MPa) | 239 | 178 | 123 | 81 | 53 |
| Creep limit, R1/100000 (MPa) | 167 | 126 | 89 | 59 | 36 |
Heat and plastic treatment
Rolling and forging at a temperature of 1100 - 850 ℃
Normalizing annealing at temperatures of 890 - 950℃
Relief annealing at a temperatures of 520 - 580℃
5. GNEE 13CrMo4-5, 1.7335, 13CrMo4-4 - boiler steel
13CrMo4-5, 1.7335, 13CrMo4-4, A182 F11 boiler steel for power engineering in accordance with EN 10273, EN 10222-2, EN 10028-2, and EN 10216-2.
| Standards | Steel Grades | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | V: | Ti: | Cu: | W: | Al: | N: | |
| PN | 15HM | |||||||||||||
| 0.11 - 0.18 | 0.4 - 0.7 | 0.15 - 0.35 | <0.04 | <0.04 | 0.7 - 1.0 | 0.40 - 0.55 | <0.35 | - | - | <0.25 | - | <0.02 | - | |
| EN | 13CrMo4-5 - 13 CrMo 4-5 - 13CrMo4-4 - 13 CrMo 4-4 - 1.7335 | |||||||||||||
| 0.08 - 0.18 | 0.4 - 1.0 | <0.35 | <0.025 | <0.01 | 0.70 - 1.15 | 0.4 - 0.6 | - | - | - | <0.30 | - | - | <0.012 | |
| ISO | 14CrMo4-5 - 14 CrMo 4-5 | |||||||||||||
| 0.10 - 0.18 | 0.4 - 0.7 | <0.40 | <0.025 | <0.015 | 0.80 - 1.15 | 0.4 - 0.6 | - | - | - | - | - | - | - | |
| EN | 13CrMoSi5-5 - 13 CrMoSi 5-5 - 1.7336 | |||||||||||||
| <0.17 | 0.40 - 0.65 | 0.50 - 0.80 | <0.015 | <0.005 | 1.00 - 1.50 | 0.45 - 0.65 | <0.3 | - | - | <0.3 | - | - | <0.012 | |
| AFNOR | 15CD4.05 - 15CD4 - 15 CD 4.05 | |||||||||||||
| <0.18 | 0.4 - 0.8 | 0.15 - 0.35 | <0.035 | <0.035 | 0.8 - 1.2 | 0.4 - 0.6 | <0.3 | - | - | - | - | - | - | |
| GOST | 15ChM - 15KhM - 15ХМ | |||||||||||||
| 0.11 - 0.18 | 0.40 - 0.70 | 0.17 - 0.37 | <0.035 | <0.035 | 0.80 - 1.10 | 0.40 - 0.55 | <0.3 | <0.05 | <0.03 | <0.3 | <0.2 | - | <0.2 | |
| ASTM | A182 Grade F11 class 2 and 3 - SA182 F11 class 2 and 3 - UNS K11572 | |||||||||||||
| 0.1 - 0.2 | 0.3 - 0.8 | 0.5 - 1.0 | <0.040 | <0.040 | 1.0 - 1.5 | 0.44 - 0.65 | - | - | - | - | - | - | - | |
| ASTM | A182 Grade F12 class 1 - SA182 F12 class 1 - UNS K11562 | |||||||||||||
| 0.05 - 0.15 | 0.3 - 0.61 | <0.5 | <0.045 | <0.045 | 0.8 - 1.25 | 0.44 - 0.65 | - | - | - | - | - | - | - | |
| UNS | UNS K12062 | |||||||||||||
| <0.20 | 0.3 - 0.8 | <0.6 | <0.045 | <0.045 | 0.80 - 1.25 | 0.44 - 0.65 | - | - | - | - | - | - | - | |
13CrMo4-5, 1.7335 - Characteristics and application
13CrMo4-5 low alloy steel is a relatively low-carbon chrome-molybdenum grade compared to other related high temperature grades, characterized by good cold and hot workingability, excellent machinability, weldability while maintaining high strength properties at room temperature and elevated temperatures.
The closest equivalent of 13CrMo4-5, more commonly found in the form of products, is used as a half-finished product for parts and subassemblies for the power industry, as well as for chemical industry that work in the temperature up to 530 ℃ - in contact with liquids containing various concentrations of "hard" substances, gases and steam that may contain numerous chemicals - pressure equipment components, boilers, turbines and power systems.
In the 13CrMo4-5 grade are made parts for the fittings for the installations - bottoms, flanges, knee, tees, profiles, seamless tubes, as well as bars, forgings, flat bars and hot rolled sheets with various thickness and dimensions. Earlier mentioned fittings are used for steam and other discharge ducts, such as pipelines and superheater pipes.
For hot rolled, forgings, and forged materials, these products are used for screws, nuts, struts and parts of boilers and steam turbines. Flat products - such as plates or tapes are used as parts for pressure vessels, turbine blades, steamers or steam collectors.
15HM steel is primarily delivered in heat-treated, softened, normalized and tempered state.
Mechanical properties in normalized state for individual dimensions
Tensile strength RmDimensions: <16 - 60mm = 450 - 600 N/mm2
Dimensions: 60 - 100mm = 440 - 590 N/mm2
Dimensions: 100 - 150mm = 430 - 580 N/mm2
Yield point Rp0.2Dimensions: <16mm = > 300 N/mm2
Dimensions: 16 - 60mm = > 295 N/mm2
Dimensions: 60 - 100mm = 275 N/mm2
Dimensions 100 - 150mm = > 255 N/mm2
Notch toughness at room temperature KVDimensions: 16 - 60mm = > 31 J
Dimensions: 60 - 150mm = > 27 J
Elongation ADimensions: 16 - 60mm = > 20 %
Dimensions: 60 - 150mm = > 19 %
Heat treatment of 13CrMo4-5 - processes, cooling and temperatures
Softening annealing at the temperature of 600 - 700℃
Normalizing with cooling in calm air at the temperature of 910 - 940℃
Relief annealing with calm air cooling at the temperatures of 660 - 710℃
Hardening with cooling in water at the temperature of 890 - 910 ℃, when cooling in oil - 900 - 930 ℃
Tempering in calm air at temperatures of 650 - 720 °C
GNEE STEEL 13CrMo4-5 steel grade provides:
Hot-rolled and bright bars 13CrMo4-5, 1.7335
Forged bars 13CrMo4-5, 1.7335
Forgings 13CrMo4-5, 1.7335
Seamless tubes 13CrMo4-5, 1.7335
Hot-rolled sheets and plates 13CrMo4-5, 1.7335
6.GNEE 25CrMo4, 1.7218, AISI 4130 - Engineering steel
Alloy engineering steel and high pressurre boiler steel 25CrMo4, 1.7218, AISI 4130 with increased strength for construction and operation at elevated temperatures.
| Standards | Steel Grades | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | V: | Ti: | Cu: | N: | W: | Al: | |
| PN | 25HM | |||||||||||||
| 0.22 - 0.29 | 0.40 - 0.70 | 0.17 - 0.37 | <0.035 | <0.035 | 0.8 - 1.1 | 0.15 - 0.25 | <0.3 | - | - | - | - | - | - | |
| PN | 20HM | |||||||||||||
| 0.19 - 0.26 | 0.50 - 0.80 | 0.15 - 0.35 | <0.035 | <0.035 | 0.9 - 1.2 | 0.4 - 0.5 | <0.6 | - | - | - | - | - | <0.02 | |
| GOST | 20ChM - 20KhM - 20ХМ | |||||||||||||
| 0.15 - 0.25 | 0.40 - 0.70 | 0.17 - 0.37 | <0.035 | <0.035 | 0.8 - 1.1 | 0.15 - 0.25 | <0.3 | <0.05 | <0.03 | <0.3 | <0.008 | <0.2 | - | |
| EN | 25CrMo4 - 1.7218 - 25 CrMo 4 - 7218 | |||||||||||||
| 0.22 - 0.29 | 0.60 - 0.90 | <0.4 | <0.025 | <0.035 | 0.9 - 1.2 | 0.15 - 0.30 | - | - | - | - | - | - | - | |
| DIN SEW |
24CrMo5 - 24 CrMo 5 - 1.7258 - 7258 - DIN 17240 / SEW 550 | |||||||||||||
| 0.20 - 0.28 | 0.50 - 0.80 | <0.4 | <0.035 | <0.035 | 0.9 - 1.2 | 0.20 - 0.35 | <0.6 | - | - | - | - | - | - | |
| ISO | 20CrMo4 - 20 CrMo 4 - 1.3567 - 3567 | |||||||||||||
| 0.17 - 0.23 | 0.60 - 0.90 | <0.4 | <0.025 | <0.030 | 0.9 - 1.2 | 0.15 - 0.25 | - | - | - | <0.3 | - | - | <0.05 | |
| AISI | AISI 4130 / SAE 4130 | |||||||||||||
| 0.28 - 0.33 | 0.40 - 0.60 | 0.20 - 0.35 | <0.035 | <0.040 | 0.8 - 1.1 | 0.15 - 0.25 | - | - | - | - | - | - | - | |
| GB/T | 30CrMo | |||||||||||||
| 0.26 - 0.34 | 0.40 - 0.70 | 0.17 - 0.37 | <0.035 | <0.035 | 0.8 - 1.1 | 0.15 - 0.25 | <0.3 | - | - | <0.3 | - | - | - | |
25CrMo4 - specification and applications
25HM steel, which is a Polish equivalent of 25CrMo4, is alternately classified as structural steel for heat improvement and as a boiler steel designed to work at elevated temperatures. It exhibits very good strength properties, high ductility, weldability and good hardenability. Compared to the 35HM and 34CrMo4 grades, after heat treatment it has slightly worse strengths, but it makes up for the lower properties with much better ductility.
25HM achieves best durability values at dimensions up to 65mm after hardening in water, while after hardening in oil at dimensions and thicknesses up to 40mm. It is most often found in a heat-treated or softened state - less commonly in the normalized state.
For use in high temperature applications - the power industry - this steel is used in the production of parts working at 450 - 530 ℃, which exhibit creep resistance: flanges and welds for pipes, covers, nuts, heavy-duty screws, turbine rotors, turbine blades, toothed shafts, steam pipes, control parts, and levers.
Dla zastosowań pracy w podwyższonych temperaturach - przemysł energetyczny - opisywana stal znajduje zastosowanie w produkcji części pracujących w temperaturach 450 - 530℃, które wykazują odporność na pełzanie, czyli: kołnierzy i wieńcy spawanych do rur, pokryw, nakrętek, obciążonych śrub, łopatek i wirników turbin, tarczy turbin, wałów uzębionych, przewodów parowych, części sterujących, drągów oraz dźwigni.
General mechanical properties of 25CrMo4 / 1.7218 / AISI 4130 steel
Tensile strength, Rm > 740 MPa
Yield point, Re > 590 MPa
Contraction Z > 55%
Elongation A > 15%
Density = ~ 7,85 g/cm3
Notch toughness > 80 J
Hardness in softened annealed state < 217 HB
Mechanical properties of bars acc. to EN 10269 (pressure/temperature application) in +QT condition
Sizes <100mmRm: 600-750 N/mm2
Rp0,2: >400 N/mm2
A: >18%
Z: >60%
KV 20C: >60J
Sizes 100-150mmRm: 600-750 N/mm2
Rp0,2: >420 N/mm2
A: >18%
Z: >60%
KV 20C: >60J
Mechanical properties of bars EN 10083-3 (engineering application)
Sizes <16mm in +QT conditionRm: 900 - 1100 N/mm2
Rp0,2: >700 N/mm
A: >12%
Z: >50%
Sizes 16-40mm in +QT conditionRm: 800-950 N/mm2
Rp0,2: >600 N/mm2
A: >14%
Z: >55%
KV 20C: >50J
Sizes 40-100mm in +QT conditionRm: 650-800 N/mm2
Rp0,2: >400 N/mm2
A: >16%
Z: >60%
KV 20C: >45J
Sizes 100-150mm in +QT conditionRm: 650-800 N/mm2
Rp0,2: >400 N/mm2
A: >16%
Z: >60%
KV 20C: >45J
Hardness HBW in +A condition: <212
Hardness HBW in +S condition: <255
Mechanical properties of coldrolled strips acc. to EN 10132-3
Condition +A+LCRm: <580 N/mm2
Rp0,2: <440 N/mm
A: >19%
Hardness HV: <175
Hardness HRB: <87
Condition +QTRm: 990 - 1400 N/mm2
Hardness HRC: 31,5 - 44,0
Hardness HV: 305-435
Seamless construction tubes acc. to EN 10305, DIN 2391 and high pressure acc. to EN 10216-2
Colddrawn hardened +C / BKRm: 720 N/mm2
A: >4%
Colddrawn Semi-hardened +LC / BKWRm: >670 N/mm2
A: >6%
Colddrawn stress relieved +C+SR / BK+SRm: 650-900 N/mm2
Rp0,2: >600 N/mm2
A: >10%
Colddrawn annealed +A / GBKRm: 500-620 N/mm2
Rp0,2: >300 N/mm2
A: >24%
HB: <215
HRB: <96
Colddrawn normalized +N / NBKRm: 620-800 N/mm2
Rp0,2: >390 N/mm2
A: >18%
Hotrolled for high pressures +QT acc. to EN 10216-2Rm: 540-690 N/mm2
Rp0,2: >345 N/mm2
A: >18%
KV 20C: >40J
Open Die forgings acc. to EN 10250-3 in +QT condition - Longitudial results
Sizes <70mmRm: >700 N/mm2
Rp0,2: >450 N/mm2
A: >15%
KV 20C: >50J
Sizes 70-160mmRm: >650 N/mm2
Rp0,2: >400 N/mm2
A: >17%
KV 20C: >45J
Sizes >160mmRm: >600 N/mm2
Rp0,2: >380 N/mm2
A: >18%
KV 20C: >38J
Heat treatment and its process
Soft annealing a t680 - 720℃ with slow cooling in the furnace
Normalizing annealing at 860 - 900 °C with slow cooling in air
Hardening in oil or water at 840 - 880℃
Tempering at 540 - 680 °C with cooling in air
Eelief annealing at 650 - 700℃
Hot Tags: boiler steel, China boiler steel manufacturers, suppliers, factory
