Engineered 42CrMo / 35CrMo / 20Cr / 40Cr Grades for Shafts, Gears & Forgings

Introduction:

CJM offers high-performance alloy structural steel plates that meet the mechanical and thermal demands of modern machinery manufacturing. Our inventory includes 42CrMo, 35CrMo, 20Cr, and 40Cr plates engineered for core machine components such as drive shafts, gear blanks, and forged parts.

These grades are well-suited for applications requiring heat treatment, impact resistance, and dimensional accuracy in high-load environments.

Where These Alloy Plates Are Used

Our plates are frequently used in:

• Heavy-duty shafts and crankshafts
• Gear mechanisms and pinions
• Industrial rollers and pressure bars
• Load-bearing bolts and spindles
• Precision-forged mechanical parts

Engineers choose these materials for their high fatigue strength, thermal stability, and machinability.

Featured Grades & Recommended Uses

Grade	Standard	Application Focus
42CrMo	GB/T 3077	Heavy-load shafts, large gear systems
35CrMo	GB/T 3077	Forged pins, press rods, tool holders
20Cr	GB/T 3077	Surface-hardened transmission components
40Cr	GB/T 3077	General-purpose parts, bushings

Chemical Composition

Grade	C	Cr	Mo	Mn	Si	P	S
42CrMo	0.38–0.45	0.90–1.20	0.15–0.25	0.50–0.80	0.17–0.37	≤0.025	≤0.025
35CrMo	0.32–0.40	0.90–1.20	0.15–0.25	0.40–0.70	0.17–0.37	≤0.030	≤0.030
20Cr	0.17–0.24	0.70–1.00	—	0.30–0.60	0.17–0.37	≤0.030	≤0.030
40Cr	0.37–0.44	0.80–1.10	—	0.50–0.80	0.17–0.37	≤0.030	≤0.030

Mechanical Properties

Grade	Yield (MPa)	Tensile (MPa)	Elongation (%)	Impact Energy (J)
42CrMo	≥930	≥1080	≥12	≥63
35CrMo	≥785	≥980	≥12	≥63
20Cr	≥490	≥735	≥14	≥47
40Cr	≥785	≥980	≥12	≥47

Buyer FAQs

• Can these plates be heat-treated for enhanced surface hardness?
  ✔️ Yes, especially 20Cr and 40Cr are suitable for induction or carburizing treatment.
• Do you offer customized cutting for CNC use?
  ✔️ Yes, high-precision CNC flame and plasma cutting is available.
• What’s the MOQ for trial orders?
  ✔️ Low MOQ supported. Mixed-grade loading is also available.
• Are these materials suitable for fatigue-loaded assemblies?
  ✔️ Yes. 42CrMo and 35CrMo are fatigue-tested and used in dynamic load-bearing parts.

About CJM

CJM is a professional steel exporter from China specializing in carbon structural steel plates for machinery. We serve clients across Southeast Asia, the Middle East, Europe, Africa, and the Americas. Our strength lies in mill-direct supply, certified processing, and full export logistics support.

✓ Quality Assurance

✓ Supply Chain Reliability

✓ Trade Expertise

✓ Value-Added Services

Packing & Shipping

• Standard export packaging: Waterproof paper + steel strapping
• Custom packaging solutions available
• Container loading optimization for cost efficiency
• Experienced in handling all shipping documentation
• Flexible shipping terms (FOB, CIF, etc.)

Contact Us for Quote

📞 WhatsApp: +86 181 9190 6640

✉️ Email: info@cjmstainlesssteel.com

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