Low Alloy Structural Sheet S275J0

low alloy structural sheet S275J0

---

 

S275J0 low alloy steel material offered by GNEE is a kind of low alloy high-strength structural steel, which belongs to the grade of European standard (EN 10025).

S275J0 high strength low alloy steel has excellent mechanical properties and welding performance, so it is widely used in construction, bridge, vehicle manufacturing, machinery manufacturing and other fields.

S275J0 high tensile steel is mainly composed of iron, carbon, manganese, silicon, phosphorus and sulfur. Among them, carbon can improve the hardness and strength of S275J0 hsla steel sheet; manganese and silicon can improve the toughness and corrosion resistance of S275J0 high strength low alloy steel sheet; phosphorus and sulfur can ensure the quality and performance of S275J0 high strength plate.

 

 

THICKNESS(MM)	C	Mn	Si	P	S	N	Cu
≦40	0.18	1.5	~	0.03	0.03	0.012	0.55
>40	0.18

 

 

	Yield Strength MPa		Tensile Strength MPa		Elongation in 2 in. %
≦16	275		410-580		15
>16, ≦100	235
>100	205		380-540

Can you provide the Mill Test Certificate (MTC) EN 10204 3.1?

Yes.

 

Does the MTC show the Charpy V-Notch Impact Test at 20°C?

Yes, the 20-degree impact test result is strictly mandatory for JR grade and will be clearly stated on the MTC.

 

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.

 

Frequently Asked Questions by S275JR Buyers

 

Can we use Q235B or Q275B as an equivalent to S275JR?

Answer:
Yes, absolutely. For many structural projects, Chinese standard equivalent grades offer the exact same mechanical properties at a much more competitive price.

Q275B is the direct equivalent to S275JR. Both have a minimum yield strength of 275 MPa and require a 20°C Charpy V-notch impact test.

Q235B (equivalent to S235JR) is slightly lower in yield strength but is the most widely used and cost-effective mild steel globally.
If your project allows equivalent standards, we highly recommend Q275B to help you save costs while maintaining structural integrity. Full EN 10204 3.1 MTCs (Mill Test Certificates) will be provided for your engineering team's approval before shipment.

 

What is the thickness tolerance? Do you follow EN 10029?

Answer:
Yes, our hot-rolled steel plates are manufactured and inspected strictly in accordance with the EN 10029 standard.
By default, we supply structural plates under Class A or Class B tolerances, which strictly controls the negative tolerance to ensure the safety of your steel structures.
If your specific project requires zero negative tolerance (only positive tolerance), we can also customize the production to meet Class C requirements. Please let us know your exact specifications when requesting a quote, and we will calculate the weight and price transparently.

 

Are the plates mill edge or sheared edge / slit edge?

Answer:
We offer both options depending on your fabrication needs:

Sheared Edge / Slit Edge: Highly recommended for laser cutting, welding, and direct fabrication. The edges are clean and dimensionally precise, saving your factory secondary processing time.

Mill Edge: Available for thicker plates or raw material stockists where edge precision is not the primary concern.
When quoting, we will always clarify the edge condition with you. Most of our standard cut-to-length plates from coils are supplied with precise sheared edges.

 

Do you have ready stock, or is it new production?

Answer:
We provide flexible supply solutions based on your urgency:

Ready Stock (Delivery in 7-10 Days): We maintain a large inventory of standard sizes (e.g., 1219x2438mm, 1500x6000mm, 2000x6000mm) in major ports, ready for immediate loading.

New Production (Lead time 20-30 Days): For custom thicknesses, extraordinary widths, or massive project volumes, we will arrange a fresh mill run. Our strong relationship with top-tier Chinese mills ensures priority rolling and fast turnaround times.

 

How do you pack the plates to prevent rust during sea freight?

Answer:
We understand that tropical climates and long sea transit can cause red rust, which increases your cleaning costs. To prevent this, we utilize a strict Seaworthy Export Packing system:

Bundling: Plates are firmly secured with heavy-duty steel strapping and placed on robust wooden pallets or skids to prevent shifting.

Moisture Protection: For container shipments, we place high-capacity desiccants inside the container.

Premium Wrapping (Optional): Upon request, hot-rolled plates can be wrapped in water-proof kraft paper and plastic film to completely isolate them from salty ocean air.
While hot-rolled steel naturally has mill scale, our packing ensures it arrives at your facility in excellent, ready-to-use condition.

 

What is the difference between S275J0 and S275JR?

The difference between S275J0 and S275JR is one of the most common questions asked by structural engineers and steel buyers.

Both grades belong to the European Standard EN 10025-2 for non-alloy structural steels. They have the exact same minimum yield strength (275 MPa) and very similar chemical compositions.

The only significant difference is their impact toughness, specifically the temperature at which they undergo the Charpy V-notch impact test.

Here is the straightforward breakdown:

1. The Meaning of "JR" vs. "J0"

The letters and numbers at the end of the steel grade indicate the temperature at which the steel is guaranteed to absorb a minimum of 27 Joules of impact energy without fracturing (breaking).

S275JR: The impact test is conducted at Room Temperature (+20°C).

S275J0: The impact test is conducted at Zero Degrees (0°C).

(Note: There is also an S275J2, which is tested at -20°C).

 

2. Why Does This Difference Matter? (The Technical Aspect)

As temperatures drop, steel naturally loses its toughness and becomes more brittle (prone to cracking or shattering upon impact).
Because S275J0 is tested at a colder temperature (0°C) than S275JR (+20°C), it means S275J0 has superior toughness and better resistance to brittle fracture in cold environments. To achieve this, the steel mill strictly controls the chemical composition (usually slightly lower phosphorus and sulfur content) during the melting process.

 

3. Application Differences (When to use which?)

S275JR (Standard Grade):

This is the standard, everyday mild steel.

Best for: Indoor structural applications, general fabrication, and outdoor structures in mild or warm climates (such as Southeast Asia, the Middle East, or Africa).

S275J0 (Cold-Resistant Grade):

This is a higher-quality grade for harsher environments.

Best for: Outdoor bridges, offshore platforms, and heavy load-bearing structures in regions where winter temperatures frequently drop to freezing (0°C), such as Northern Europe, Canada, or high-altitude mining areas.

 

4. Price and Availability (The Commercial Aspect)

Availability: S275JR is the "commodity grade." It is mass-produced and heavily stocked globally by distributors. You can almost always find S275JR plates or coils in ready stock. S275J0 is less commonly kept in stock and may require a new rolling order from the mill.

Price: Because S275J0 requires stricter chemical control and additional low-temperature testing during production, it is generally slightly more expensive than standard S275JR.

 

Quick Comparison Table

Feature	S275JR	S275J0
Standard	EN 10025-2	EN 10025-2
Min. Yield Strength	275 MPa	275 MPa
Impact Test Temperature	+20°C	0°C
Min. Impact Energy	27 Joules	27 Joules
Best Environment	Normal / Warm climates	Freezing / Cold climates
Cost & Sourcing	Cheaper, widely in stock	Slightly higher, often rolled to order

 

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

 

 

 

 

 

 

We have excellent after-sales service. If you have any questions about low alloy structural sheet S275J0, you can contact us and we will reply you within two hours.