ASTM A662 Carbon Boiler Plate

ASTM A662 carbon boiler plate Grade A/B/C is a normalized carbon-manganese steel plate designed for use in boilers and pressure vessels operating at moderate temperatures. With enhanced notch toughness, improved ductility, and excellent weldability, ASTM A662 is widely used in critical equipment across oil & gas, petrochemical, and power industries.

 

As a professional exporter, GNEE Steel supplies high-quality ASTM A662 boiler plates with full certification, strict quality control, and reliable global delivery.

 

 

ASTM A662 carbon boiler plate is a kind of carbon-manganese-silicon steel plate formulated by ASTM International, mainly designed for welded pressure vessels that require improved low-temperature notch toughness.

 

As a professional ASTM A662 supplier with 18 years of experience, GNEE provides three grades (Grade A, Grade B, Grade C) of this boiler plate, which are widely used in moderate and low-temperature service scenarios such as energy, chemical, electric power and water conservancy industries.

 

Our ASTM A662 carbon boiler plate fully complies with ASTM A662/A662M-17 standard, with strict quality control and stable performance, perfectly meeting the needs of global customers for high-reliability pressure vessel materials.

 

Available Grades:

• ASTM A662 Grade A
• ASTM A662 Grade B
• ASTM A662 Grade C

Grade C offers the highest strength among the three grades.

 

 

Chemical Composition (%)	ASTM A662 Grade A	ASTM A662 Grade B	ASTM A662 Grade C	Standard
Carbon (C)	≤0.17	≤0.22	≤0.24	ASTM A662/A662M-17
Silicon (Si)	0.13-0.45	0.13-0.45	0.13-0.55
Manganese (Mn)	0.84-1.46	0.79-1.62	0.92-1.72
Phosphorus (P)	≤0.035	≤0.035	≤0.035
Sulfur (S)	≤0.035	≤0.035	≤0.035

 

 

Mechanical Properties	ASTM A662 Grade A	ASTM A662 Grade B	ASTM A662 Grade C	Note
Yield Strength (Min, MPa)	275 (6-50mm); 275 (50-200mm)	275 (6-50mm); 275 (50-200mm)	295 (6-50mm); 295 (50-200mm)	Thickness-dependent
Tensile Strength (MPa)	400-540	450-585	480-620	-
Elongation (Min, %)	23 (6-50mm); 20 (50-200mm)	23 (6-50mm); 20 (50-200mm)	22 (6-50mm); 18 (50-200mm)	Thickness-dependent
Delivery Status	Hot rolled (≤40mm); Normalized (＞40mm, mandatory); Stress relieved (optional)			-
Thickness Range	6-200mm (max thickness limited by mechanical property requirements)			-
Equivalent Grade	EN 10028-P290; JIS G3115-SPV235	EN 10028-P295GH; JIS G3115-SPV245	EN 10028-P315; JIS G3115-SGV315	International equivalent

 

 

Superior Low-Temperature Toughness: The plate maintains excellent impact toughness even in -40℃ to -45℃ environment (impact energy ≥27J), effectively preventing brittle fracture and adapting to extreme cold working conditions. It is especially suitable for low-temperature pressure vessels such as liquefied gas storage tanks.

 

High Strength & Stability: Different grades have corresponding mechanical properties. For example, Grade C has a yield strength of ≥295MPa and a tensile strength of 480-620MPa (when thickness ≤50mm), which can stably bear high pressure and meet the structural support requirements of boiler drums and pressure vessels.

 

Excellent Weldability & Processability: The carbon equivalent is reasonably controlled, supporting shielded metal arc welding, gas metal arc welding, submerged arc welding and other processes. The welding joint has high strength and good air tightness. It is easy to cut, form and process, and can be customized into complex shapes according to customer needs.

 

Strict Quality Control: Adopts electric arc furnace or basic oxygen furnace smelting, combined with ladle refining technology, strictly controlling harmful elements such as phosphorus (P≤0.035%) and sulfur (S≤0.035%) to ensure the purity of steel plates. All products pass ultrasonic flaw detection (ASTM A435/A577) and other tests to ensure no internal defects.

 

Customization & Timely Supply: We provide customized services for thickness (6-200mm), width, length and processing (cutting, drilling, surface treatment), and have sufficient inventory to meet the urgent needs of customers. Our sales network covers more than 200 countries, ensuring timely delivery worldwide.

 

 

ASTM A662 carbon boiler plate is widely used in industries that require high toughness, high strength and low-temperature resistance, especially suitable for welded pressure vessels and boiler components. Its main application scenarios include:

 

Energy & Chemical Industry

Nuclear energy equipment (reactor pressure vessel, boiler drum), low-temperature storage tanks (liquefied gas spherical tank), petrochemical reactors, separators and heat exchangers, which can adapt to high pressure, low temperature and corrosive working conditions.

 

Electric Power & Water Conservancy

Power station boiler drum structural parts, hydropower station high-pressure water pipes and water turbine volutes, which can bear water pressure impact and ensure the stable operation of power and water conservancy equipment.

 

Other Fields

Oil and gas storage and transportation equipment (oil and gas tanks, liquefied petroleum gas cylinders), food industry pressure vessels, and other low-temperature and medium-pressure equipment components that require high reliability.

 

 

Grade	Key Feature	Application
ASTM A662	Normalized, improved toughness	Boilers & vessels
ASTM A285	Lower strength, basic applications	Low-pressure tanks
ASTM A516	Higher strength & toughness	Medium-pressure vessels

ASTM A662 offers a middle-ground solution between A285 and A516 in terms of strength and toughness.

 

 

Standard	Equivalent Grade	Description
EN (Europe)	P295GH	Pressure vessel steel with similar strength
DIN (Germany)	1.0481 / HII	Boiler steel with good toughness
JIS (Japan)	SB480	Boiler and pressure vessel steel
GB (China)	Q345R / 16MnR	Pressure vessel steel widely used in China

Notes:

Exact equivalence depends on heat treatment and impact requirements

ASTM A662 is typically supplied in normalized condition, similar to EN P295GH

 

 

Smelting: Adopt electric arc furnace (EAF) or basic oxygen furnace (BOF) smelting process, combined with ladle refining (LF) technology, strictly control the content of harmful impurities, and ensure the uniformity and purity of chemical composition.

 

Rolling: Apply controlled rolling and controlled cooling (CRCC) technology, heat the billet to 1100-1250℃ for hot rolling, and precisely control rolling speed, pressure and cooling rate to improve grain refinement and surface quality.

 

Heat Treatment: Take normalizing heat treatment as the core, heat the steel plate to 890-950℃ for heat preservation, then cool it in air to optimize the microstructure, eliminate internal stress and improve low-temperature toughness.

 

Inspection: Conduct strict quality inspection, including chemical composition analysis, mechanical property test (tensile, impact, bending), ultrasonic flaw detection (ASTM A435/A577), and other tests to ensure that each batch of products meets the standard requirements.

 

Processing & Packaging: Provide customized processing such as laser cutting, flame cutting and drilling according to customer needs; adopt standard seaworthy packaging to prevent corrosion during transportation and ensure the integrity of products.

 

 

What is the ASTM A662 equivalent to?

ASTM A662 equivalents include European standards like EN 10028-2 and JIS standards, with specific grade matches such as P275NL1 for A662 Grade A, P295GH or P290 for A662 Grade B, and P355NH or SGV315 for A662 Grade C.

 

What is ASTM A662 steel used for?

It is used for boilers and pressure vessels operating at moderate temperatures.

 

What grades are available?

Grade A, Grade B, and Grade C.

 

Which grade is strongest?

Grade C has the highest strength.

 

 Is ASTM A662 heat treated?

Yes, it is supplied in normalized condition.

 

What is the advantage of ASTM A662?

Better toughness than A285 with good cost-performance balance.

 

Can ASTM A662 be welded?

Yes, it has excellent weldability.

 

What industries use ASTM A662?

Oil & gas, petrochemical, power plants, and manufacturing.

 

What is the equivalent EN grade?

P295GH is commonly used as a reference.

 

What thickness is available?

Typically 6mm to 150mm.

 

Does GNEE provide export services?

Yes, we provide full export support and documentation.

 

What is the difference between ASTM A662 Grade A, B and C?

The main difference lies in the manganese content and mechanical properties. The manganese content increases from Grade A to Grade C, which leads to the gradual improvement of tensile strength and yield strength. Grade C has the highest strength and is suitable for more demanding low-temperature and high-pressure scenarios.

 

Can GNEE provide customized thickness and size for ASTM A662 carbon boiler plate?

Yes. We support customized services for thickness (6-200mm), width (1250-4200mm) and length (3000-27000mm). We can also provide cutting, drilling, surface shot blasting and other processing according to your drawings and requirements.

 

What is the delivery time of ASTM A662 carbon boiler plate?

For spot products, the delivery time is 3-7 working days; for customized products, the delivery time is 15-30 working days, depending on the order quantity and processing requirements. We have sufficient inventory to ensure timely delivery to global customers.

 

Does ASTM A662 carbon boiler plate meet the export standards of European and American markets?

Yes. Our products fully comply with ASTM A662A662M-17 standard, and have passed ISO, SGS and other certifications. They have been exported to the United States, Canada, Spain, Singapore and other countries, and fully meet the local import standards and usage requirements.

 

How to solve the welding problem of ASTM A662 carbon boiler plate?

The plate has excellent weldability. It is recommended to preheat to 50-100℃ before welding (preheat to ≥150℃ when thickness ＞30mm), control the heat input to ≤45 kJ/cm, and perform post-weld stress relief annealing to eliminate residual stress and ensure the reliability of the welding joint.

 

 

Petrochemical Customer in Mexico Customer Demand: Need ASTM A662 Grade C carbon boiler plate with thickness 20mm, used for manufacturing low-temperature liquefied gas storage tanks, requiring -40℃ impact toughness and ultrasonic flaw detection Grade II.

 

GNEE Solution: Customized production according to customer requirements, strictly controlling the manganese content and heat treatment process, providing free sample testing, and completing delivery within 18 working days.

 

Cooperation Feedback: The product performance is stable, fully meeting the requirements of low-temperature service, and has established long-term cooperative relations.

 

 

Tell us your requirements, and GNEE will provide you with a professional quote and customized solution within 24 hours!

 

GNEE Promise: We will keep your information confidential and will not disclose it to any third party. Your inquiry will be replied to within 24 working hours.

 

GNEE Steel (Tianjin) Co., Ltd. | 18 Years of Industrial Steel Supply Experience

 

 

Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.

 

GNEE STEEL  PROCESSING

1.CTL & SL SERVICE (141 SETS)

Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.

CTL FACILITIES
Max Length:16500mm

Max Width:2200mm

Max Thickness:25.4mm

Max Yield Strength:1500Mpa
SL FACILITIES

Max Width:2200mm

Max Thickness:18mm

Max slit Quantity:31

Max Yield Strength:1200Mpa

 

2.CUTTING SERVICE

GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.

Laser Cutting Machine

Max Cutting Length:40,000mm

Max Width:4,600mm
Max Thickness:100mm

 

Flame Cutting Machine

Max Cutting Length:40,000mm

Max Width:8,000mm
Max Thickness:500mm

Plasmas Cutting Machine

Max Cutting Length:30,000mm

Max Width:5,000mm
Max Thickness:100mm

 

Water-jet Cutting

Max Cutting Length:12,000mm

Max Width:4,010mm
Max Thickness:250mm

3.FORMING SERVICE

Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm

   

Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm

Expert in Bending High-Strength & Wear-Resistant Steels

  

  

Punching Machine

Max Width:3,070mm
Max Thickness:8mm

Max Pressure:250t

BEVELING SERVICE

GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.

 

Milling：
Max Cutting Length:18,000mm

Max Width:4500mm
Max Thickness:120mm

 

  

Beveling:
Max Length:16,000mm

Max Thickness:80mm

MACHINING SERVICE

GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.

Gantry Type Boring & Milling Maching Center

Max Length:48000mm

Max Width:12500mm
Max Height:8000mm

Max Diameter:10500mm

Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm

MMulti-hole Drilling Equipment

Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm

Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m

Vertical Lathe

Max Height:6,000mm

Max Diametar:φ22,00mm

Automated Edge Milling Machine

The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.

 

It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.

 

Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.

 

Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons

 

This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.

 

• Processing Accuracy

Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;

Width accuracy: ±1mm;

Diagonal accuracy: ±2mm;

Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.

• Processing Efficiency

The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.

HEAT TREATMENT

Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t

Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head

 

 

GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.

 

One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.

 

Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production

 

Project Materials and Technical Requirements

 

The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.

 

Key technical specifications include:

• Material grades: P355NL2 and P275NL2 (Normalized)
• Yield strength: Standard minimum / Maximum limited to 390 MPa
• Hardness: ≤ 225 HBW in base material
• Impact testing: Charpy-V notch test at -50°C, minimum 27J
• Certification: EN 10204 3.1 certificate, with optional 3.2 certification

 

These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.

 

Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.

 

Project Plate Quantities and Thickness Distribution

 

The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:

 

P355NL2 – Inner & Outer Tank Shell Plates

• Lower shell courses: 50 mm thickness – approx. 2,000 tons
• Middle shell courses: 25 mm thickness – approx. 1,400 tons
• Upper shell courses: 10 mm thickness – approx. 500 tons

 

P275NL2 – Tank Bottom Plates

• Thickness: 10–15 mm – approx. 750 tons

 

P275NL2 – Suspended Roof Structure

• Thickness: 5–8 mm – approx. 180 tons

 

S275JR – Outer Roof (Ambient Structure)

• Thickness: 10 mm – approx. 450 tons

 

To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.

 

Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.

 

GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.

Request A Quote

 

TYPE	GRADE	SPECIFICATIONS
Carbon Steel / Low Alloy Coil	Q235A/B/C/D/Q355B(Q345B)/C/D/E/SS400/SAPH400-C/ASTMA283Grade C	0.7~2.0*1250/1500mm*C 2.3~19.5*1250/1500/1800/2000mm*C
Medium Heavy Plate	Q235B/Q355B(Q345B)/C/D/E	6.0-200x150mm-4000mmxL
Vessel Plate	Q245R/Q345R/HP295/SA516MGR485/SA516GR70/P355NL2/P275NL2/ S275JR//SPV490/ASTM A537 Class 1/Class 2	2.5-120x1500mm-3000mmxL
High Strength Steel	510L/610L/700L/750L/BS600MCK4/BS700MCK2/BS700MCK4/ BS960E/BWELDY700QL2/L4/BWELDY960QL4/HG60D/70D/785D/ Q460D/Q550D/690D/690E/TQ600MCD/TQ700MCD/S700MCD/ WYS600/700/STRENX700MCE/Q490E/Q490D	1.2-60x 1500mm-2500mmxL
Patterned Steel	HQ235A|B	1.2-60x 1500mm-2500mmxL
Wear-resistance Steel	NM360/400/450/500/NM300TP/400TP/450TP/ ABREX400/450/500/B-HARD450XKY/ CREUSABRO4800/8000/EH C400LE/450LE/500LE/ HADOX450/500	3.0-50x1250mm-3300mmxL
Cold Rolled Coil	DC01/RECC/REDT/SPCC/ST12	0.5-3.0x1250mm-1500mmxC
Galvanized Plate	DC51D+AZ/DC51D+Z/DX51D+Z/SGH340+Z275/Z275/Z120/S350GD+ZM275	0.45-3.0x1250mm-1500mmxC
Pickled Coil	DD11/SPHC	2.0-6.0x1500xC

Stainless Steel Material and Surface Specifications

TYPE	GRADE	THICKNESS	SURFACE
Austenitic	304/304H/304L/304J1	0.25-150mm	2B/BA/NO.4/8K/SB/HL/NO.1
Austenitic	321	0.4-80mm	2B/BA/NO.4/8K/SB/HL/NO.1
Austenitic	316/316L/317L/316Ti	0.3-80mm	2B/BA/NO.4/8K/SB/HL/NO.1
Austenitic	201(J1/J2/J5)	0.35-12mm	2B/NO.1/1D
Ferrite	430	0.4-3.0mm	2B/BA/NO.4/8K/SB/HL
Ultra Pure Ferrite	443	0.4-2.0mm	2B
Ultra Pure Ferrite	436L/439/444/441	0.5-3.0mm	2B/2D

Special Steel / Nickel Base Alloy

TYPE	GRADE	GRADE (ASTM)	GRADE (EN)	THICKNESS
Heat-resistant Steel	309S	S30908	1.4833	0.5-40mm
Heat-resistant Steel	310S	S31008	1.4845	0.5-40mm
Duplex Stainless Steel	2101	S32101	1.4162	1.5-50mm
Duplex Stainless Steel	2304	S32304	1.4362	3.0-50mm
Duplex Stainless Steel	2205	S32205/S31803	1.4462	0.5-60mm
Duplex Stainless Steel	2507	S32750	1.4410	1.0-60mm
Super Austenitic-Steel	904L	N08904	1.4539	0.6-50mm
Super Austenitic-Steel	254SMO	S31254	1.4547	0.5-50mm
Super Austenitic-Steel	1.4529	N08926	1.4529	0.5-50mm
Super Austenitic-Steel	AL-6XN	N08367	1.4478	0.5-50mm
Nickel Base Alloy	Alloy 31	N08031	1.4562	1.0-50mm
Nickel Base Alloy	800	N08800	1.4876	0.8-50mm
Nickel Base Alloy	800H	N08810	1.4958	0.8-50mm
Nickel Base Alloy	800HT	N08811	1.4959	0.8-50mm
Nickel Base Alloy	Alloy 28	N08028	1.4563	1.0-20mm
Nickel Base Alloy	Alloy 20	N08020	2.4660	1.0-20mm
Nickel Base Alloy	825	N08825	2.4858	0.8-40mm
Nickel Base Alloy	C276	N10276	2.4819	0.5-50mm
Nickel Base Alloy	C22	N06022	2.4602	1.0-50mm
Nickel Base Alloy	625	N06625	2.4856	0.8-20mm
Nickel Base Alloy	400	N04400	2.4360	1.0-20mm
Nickel Base Alloy	600	N06600	2.4816	1.0-50mm
Nickel Base Alloy	Pure Ni 201	N02201	2.4061	0.5-20mm
Titanium	TA1	Gr.1	Class 1	0.5-50mm
Titanium	TA2	Gr.2	Class 2	0.5-50mm

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