Premium Alloy Steel Plates for Pressure Vessels & Boilers

Product Range & Introduction:

ASTM A387 Steel Plate is a high-quality alloy steel plate designed to provide superior resistance to elevated temperatures and pressure. It is widely used in the manufacture of boilers, pressure vessels, heat exchangers, and power plants. Supplied mainly in Grades 11, 12, 22, 91, this plate meets stringent standards for toughness, weldability, and corrosion resistance.

CJM is a trusted Chinese exporter with large inventory and customized processing services, catering to global buyers in the Middle East, Southeast Asia, Africa, Europe, and the Americas.t pressure conditions. All grades are supplied in as-rolled, normalized, or stress-relieved condition upon request.

Available Grades & Specifications

Grade	Description	Common Use
Grade 11	Chromium-Molybdenum alloy steel	Boilers, pressure vessels
Grade 12	Chromium-Molybdenum alloy with improved properties	High-temp equipment
Grade 22	Higher chromium content, better corrosion resistance	Power plants, chemical tanks
Grade 91	Advanced creep-resistant steel for ultra-high temp	Heat exchangers, nuclear reactors

Chemical Composition

Element	Grade 11 (%)	Grade 12 (%)	Grade 22 (%)	Grade 91 (%)
Carbon (C)	0.05-0.15	0.05-0.15	0.07-0.15	0.08-0.12
Chromium (Cr)	0.90-1.20	0.90-1.20	1.90-2.60	8.00-9.50
Molybdenum (Mo)	0.44-0.65	0.44-0.65	0.87-1.10	0.85-1.05
Nickel (Ni)	0.40 max	0.40 max	0.40 max	0.40 max
Manganese (Mn)	0.30-0.60	0.30-0.60	0.30-0.60	0.30-0.60

Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Energy (J)
Grade 11	≥275	415-565	≥22	≥27
Grade 12	≥275	415-565	≥22	≥27
Grade 22	≥275	415-565	≥22	≥27
Grade 91	≥415	585-735	≥20	≥27

Dimensions & Tolerances

• Thickness: 6 mm to 150 mm
• Width: up to 3000 mm
• Length: up to 12000 mm
• Tolerances: ASTM A20 standard
• Surface: Hot rolled with mill or shot-blasted finish
• Edges: Mill edge or sheared

Custom sizes and cutting service available.

Applications

• High-temperature boilers and pressure vessels
• Power plants and thermal stations
• Petrochemical industry reactors and tanks
• Heat exchangers and nuclear reactors
• Chemical processing equipment

Why Choose CJM for ASTM A387 Plates?

• Annual inventory exceeds 1 million tons, ensuring quick delivery
• Certified steel plates meeting ASTM and international standards
• Advanced processing: cutting, beveling, drilling available
• Global logistics with export hubs in Tianjin, Shanghai, Qingdao
• Trusted by customers across Asia, Africa, Middle East, Europe, and Americas

Packaging & Shipping

• Bundled with steel strips
• Waterproof wrapping & edge protection
• Wooden pallets or as per buyer request
• Shipping by container or bulk vessel

Request a Quote

Contact CJM to get the best price for ASTM A387 Alloy Steel Plates in all grades and sizes.
👉 Fill out our contact form or email us at info@cjmstainlesssteel.com to get your free quote and mill certificate.

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment