SA537 Class 1 Class 2 SA537 CL1 CL2 Pressure Vessel Steel Plate

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional sa537 class 1 class 2 sa537 cl1 cl2 pressure vessel steel plate manufacturers and suppliers in China. Welcome to wholesale customized sa537 class 1 class 2 sa537 cl1 cl2 pressure vessel steel plate at competitive price from our factory. Good service and quality products are available.

 

Introduction to SA537 Pressure Vessel Steel

ASTM A537 Class 1 (SA537 Cl.1) and Class 2 (SA537 Cl.2) are heat-treated carbon-manganese steel plates designed for welded pressure vessels requiring exceptional toughness and strength. These grades are specified in critical applications such as:

LNG storage tanks (-45°C service)

Hydrogen reactors (ASME Section VIII compliance)

Offshore platform components (NACE MR0175 compliance)

Certified under ASTM A537/A537M, these plates are available in normalized (Cl.1) or quenched & tempered (Cl.2) conditions.

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SA537 Cl.2 steel plate ultrasonic testing for LNG tanks Technical Specifications

Chemical Composition (ASTM A537)

Element	SA537 Cl.1 (wt%)	SA537 Cl.2 (wt%)
C	≤0.24	≤0.27
Mn	0.70–1.35	0.80–1.60
Si	0.15–0.50	0.15–0.50
P	≤0.035	≤0.035
S	≤0.035	≤0.035

Cl.2 contains controlled microalloying (Nb/V) for enhanced grain refinement.

Mechanical Properties

Property	SA537 Cl.1	SA537 Cl.2
Yield Strength	≥345 MPa	≥415 MPa
Tensile Strength	485–620 MPa	550–725 MPa
Elongation (A50)	≥18%	≥16%
Impact Energy	≥27J @ 0°C	≥54J @ -45°C
Hardness	≤235 HBW	≤265 HBW

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Key Differences & Selection Guide

1. Heat Treatment

SA537 Cl.1: Normalized (improves uniformity for thickness ≤100mm)

SA537 Cl.2: Quenched & Tempered (required for thickness >50mm)

2. Application-Specific Advantages

Application	Recommended Grade	Reason
Cryogenic Tanks	Cl.2	Superior -45°C impact toughness
General Pressure Vessels	Cl.1	Cost-effective for moderate temps
Sour Service Equipment	Cl.2 + NACE	HIC resistance with TMCP processing

3. Cost & Availability

Cl.1: 15–20% lower cost than Cl.2 (ideal for budget projects)

Cl.2: Longer lead time (8–12 weeks) due to Q&T processing

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Industrial Applications

1. Energy & Petrochemical

Cl.1:

Boiler drums (ASME BPVC Section I)

Compressed air receivers (≤10MPa)

Cl.2:

LNG storage tanks (ASTM A645 compatibility)

Hydrocracking reactors (H₂ partial pressure ≥3MPa)

2. Offshore & Marine

Cl.2:

Floating production storage vessels (FPSO)

Subsea manifolds (DNV GL certified)

3. Specialized Fabrication

Cl.1:

Heat exchanger shells (non-corrosive media)

Low-pressure distillation columns

Cl.2:

Cryogenic transport ISO containers (EN 13445-3)

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Quality Assurance & Testing

Mandatory Inspections

Ultrasonic Testing: ASTM A435 Level III for Cl.2 (flaws ≥3.2mm)

Charpy V-Notch: 3 specimens tested at design temperature

Hardness Survey: ASTM E10 Brinell testing (10mm grid)

Certifications

ASME Stamp: U2/U3 for pressure vessel fabrication

EN 10204 3.2: Mill test certificates with traceability

NACE MR0175: Optional for H₂S environments

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Global Supplier Data

Parameter	SA537 Cl.1	SA537 Cl.2
Thickness Range	6–100mm	10–150mm
Width	1,500–4,500mm	1,500–4,500mm
Delivery Terms	FOB Shanghai/Qingdao	CFR/CIF Global
Lead Time	30–45 days	60–75 days
MOQ	5MT	10MT

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Why Choose SA537 Over Alternatives?

Case Study: Arctic LNG Storage Tank

Challenge: -50°C operation with cyclic thermal stresses

Solution:

Material: SA537 Cl.2 plates (80mm thickness)

Welding: Submerged arc welding (SAW) with AWS A5.23 EF3 wire

Result: Passed 100,000 fatigue cycles (EN 13445-3)

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FAQ: SA537 Pressure Vessel Plates

Q: Can SA537 Cl.2 be used for hydrogen service?
A: Yes, with supplementary HIC testing per NACE TM0284.

Q: What's the maximum allowable stress for Cl.1?
A: 138MPa @ 100°C (ASME Section II-D Table 1A).

Q: How does SA537 compare to A516 Gr.70?
A: SA537 Cl.2 offers better low-T toughness (-45°C vs -29°C for A516).

ASTM A537 normalized steel supplier Chemical Composition and Mechanical Property:

Grade	Chemical Composition(%)
	C	Si	Mn	P	S
SA537 Class 2(SA537CL2)	0.24	0.13-0.55	0.92-1.72	0.035	0.035
Grade	Mechanical Property
	Tensile Strength(MPa)	Yield Strength(MPa)	% Elongation in 2 in.(50mm) min	Impacting Test Temperature(°C)
SA537 Class 2(SA537CL2)	485-690	315-415	20	-20,40,-60

 

SA537 Cl.2 for LNG tanks Our advantage

Quality first: production and inspection in strict accordance with production standards;
Price advantage: discounts based on real market prices;
Transaction security: There will be no loss of customer funds;
After-sales guarantee: the customer's problem is our problem;
Long-term cooperation: quality assurance, price advantage, sincere service can last for a long time.

 

FAQ

1. Q: Are you a manufacturer?
A:Yes, we are manufacturers. We have our own factory and our own company. I believe we will be the most suitable supplier for you.

2. Could we visit your factory?

A: Sure, we welcome you to visit our factory , check our production lines and know more about our strength and quality.

3. Q: Do you have quality control system?

A: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.

4. Q: Can you arrange the shipment for us?

A: Yes, we have designated sea freight and railway freight forwarders with decades of experiences and we get the best price with earlist vessel and professional service.

5. Q: How long is your delivery time?

A: Generally it is 7days if we have the exact goods in our stock. If not, it will take around 15-20 days to get goods ready for delivery.

6. Q: Can I get some samples?

A: We are glad to provide free samples to you, but we do not offer the freight.

7. Q: What is your after-sale service?

A: We provide after-sale service and offer 100% guarantee on our products.

8. Q: What is your MOQ?

A: 25 Tons

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