GB/T3077 40Cr 41cr4 Scr440 1.7035 Alloy Steel Plate 3.0-10mm*1260*4000mm
Machinery Grade Alloy Steel Plate
Alloy steel plates including 40Cr, 42CrMo, and 35CrMo grades are widely used in machinery manufacturing due to their excellent mechanical performance. They are suitable for gears, shafts, transmission parts, automotive components, and heavy equipment structures requiring high strength and durability.
What Is Alloy Steel Plate?
Product Definition:
Alloy steel plate is a flat-rolled steel product manufactured by adding one or more alloying elements – such as chromium (Cr), molybdenum (Mo), vanadium (V), nickel (Ni), and manganese (Mn) – to carbon steel. These alloying elements significantly enhance the steel‘s mechanical properties, including strength, hardness, toughness, wear resistance, and high-temperature performance. Alloy steel plates are widely used in pressure vessels, boilers, chemical equipment, power generation, and heavy machinery.-9-
Key Characteristics:
| Feature |
Description |
| High Strength |
Tensile strength from 440–800+ MPa depending on grade and heat treatment |
| Heat Resistance |
Chromium and molybdenum provide excellent performance at elevated temperatures (up to 580°C) |
| Excellent Weldability |
Suitable for welding with proper preheating and post-weld heat treatment (PWHT) |
| Creep Resistance |
Molybdenum enhances resistance to deformation under prolonged high-temperature stress |
| Corrosion & Oxidation Resistance |
Chromium improves resistance to oxidation, corrosion, and hydrogen attack |
| Good Toughness |
Maintains impact resistance at low temperatures and under high-pressure conditions |
| 100% Recyclable |
Environmentally friendly with no loss of properties |
Alloy Steel vs Carbon Steel:
| Factor |
Alloy Steel Plate |
Carbon Steel Plate |
| Strength |
Higher (440–800+ MPa) |
Moderate (370–500 MPa) |
| Heat Resistance |
Excellent (up to 580°C) |
Limited (≤350°C) |
| Corrosion Resistance |
Good (Cr/Mo alloying) |
Poor |
| Cost |
Higher |
Lower |
| Applications |
Boilers, pressure vessels, power plants |
General structural, construction |
Typical Applications by Industry:
| Industry |
Applications |
Recommended Grades |
| Power Generation |
Boilers, superheaters, reheaters, steam headers, main steam pipes |
12Cr1MoV, 15CrMo, SA-387 Gr.22 |
| Pressure Vessels |
Reactors, heat exchangers, separators, accumulators |
SA-387 Gr.11/Gr.22, 16Mo3, Q345R |
| Chemical & Petrochemical |
High-temperature piping, reactors, synthesis towers, hydrogenation reactors |
SA-387 Gr.11/Gr.22, 15CrMo |
| Oil & Gas |
High-pressure pipelines, wellhead equipment, separators |
SA-387 Gr.11/Gr.22, 42CrMo |
| Nuclear Power |
Reactor pressure vessels, containment vessels |
SA-387 Gr.11/Gr.22, 20MnMo |
| Heavy Machinery |
Equipment frames, gear blanks, crane components, mining machinery |
40Cr, 42CrMo |
| Automotive |
Heavy-duty truck frames, suspension components |
40Cr, 42CrMo |
Each batch includes EN 10204 3.1 mill test certificate with full chemical and mechanical data.
Third-party inspection (SGS, BV, TÜV) supported. MOQ: 5 tons, trial orders welcome.
Key Specifications – Alloy Steel Plate
| Parameter |
Specification / Range |
Remarks |
| Standards |
GB/T 11251, ASTM A387/ASME SA-387, EN 10028, DIN |
Others on request |
| Cr-Mo Series (Heat Resistant) |
15CrMo, 12Cr1MoV, 30CrMo, 35CrMo, 42CrMo |
High-temperature boiler & pressure vessel |
| SA-387 Series (Pressure Vessel) |
Gr.11 (1.25Cr-0.5Mo), Gr.12, Gr.22 (2.25Cr-1Mo), Gr.5, Gr.9, Gr.91-24 |
Welded boilers, elevated temperature service- |
| EN Series |
16Mo3, 13CrMo4-5, 10CrMo9-10 |
European standard pressure vessel |
| Carbon/Structural Alloy |
40Cr, 45Mn2, 27SiMn, 40B, 50B-12 |
Machinery, structural components |
| Thickness |
4 mm – 150 mm (standard); custom available |
GB/T 11251: 4-30mm- |
| Width |
1000 mm – 4000 mm |
Custom on request |
| Length |
2000 mm – 12000 mm |
Custom cut to size |
| Delivery Condition |
Hot rolled, normalized, annealed, quenched & tempered (QT)--11 |
Per customer requirement |
| Surface Treatment |
As-rolled, pickled, painted (primer) |
See Screen 8 |
| Density |
7.85 g/cm³ |
– |
| Testing |
Chemical analysis, tensile, hardness, impact (Charpy), UT (optional) |
Mill cert EN 10204 3.1 |
| Packaging |
Steel strapped bundles, wooden pallet |
Seaworthy, ISPM 15 |
Frequently Asked Questions (FAQ)
Q1. What products do you mainly supply?
We mainly supply stainless steel (304/316/BA/EP pipes), carbon steel, silicon steel, copper, aluminum, and other materials in sheets, pipes, and coils. Customized processing services are also available.
Q2. Do you have stock available?
Yes, we maintain sufficient stock for most standard specifications. For non-standard sizes, we can accept orders with reasonable lead time.
Q3. Can you provide MTC (Mill Test Certificate)?
Yes, we provide MTC for every shipment. Third-party inspection (SGS, TÜV, BV, etc.) is also available upon request.
Q4. Do you support video inspection before shipment?
Yes, we fully support video inspection. You can also arrange an agent or third party to visit our factory for on-site inspection before shipment.
Q5. What are your main export markets?
We export to Southeast Asia, the Middle East, Europe, Africa, and South America. We have rich experience in international trade and export documentation.
Q6. What payment terms do you accept?
We accept T/T (wire transfer), L/C at sight (irrevocable), and sometimes a combination of T/T deposit + L/C balance. Payment terms are negotiable based on order size and customer history.
Q7. Can you provide samples?
Yes, samples are available for most standard products. For custom sizes, we may need to produce small batch samples. Sample cost and shipping are usually borne by the customer, but can be discussed.
Q8. What is your typical lead time?
For stock items: 7–10 days after order confirmation. For custom production: 20–30 days, depending on the specification and quantity.
Q9. What quality certifications do you have?
We provide MTC with every shipment. Our partner mills are ISO9001 certified. We can also assist with third-party inspections (SGS, TÜV, BV) upon request.
Q10. How can I get a quotation?
Please send us your material grade, specification (size, thickness, length), quantity, and preferred trade term (FOB, CIF, DAP, etc.). We will reply with a detailed quotation within 24 hours
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