Q235B / SS400 / S235JR / ASTM A36 Steel Sheets for General Machine Frames & Base Structures

Introduction:

With 15+ years in steel distribution, CJM has established trusted partnerships with mills and machinery manufacturers across Europe, South America, the Middle East, and India. As a specialized trader, we focus on rigorous quality control and just-in-time delivery of high-grade structural steels.

Carbon structural steel plates are the fundamental building blocks for mechanical fabrication. In machinery manufacturing, these plates offer a cost-effective solution with good strength, ductility, and weldability. CJM supplies a full range of Q235B, SS400, S235JR, and ASTM A36 steel plates, widely used in structural bases, brackets, machine shells, and low-load equipment frames.

With over 1 million tons of inventory and direct mill partnerships, CJM ensures fast delivery, certified quality, and tailored export solutions.

Typical Applications in Machinery Manufacturing

• Machine Base Plates & Frames
• Industrial Equipment Brackets & Weldments
• Tooling Platforms & Mounting Beds
• Fabricated Chassis or Housing Panels
• Non-load-bearing Structural Parts

These carbon structural plates for machinery are easy to process, cut, and weld — ideal for standard fabrication tasks in CNC machining shops, mechanical workshops, and light assembly plants.

Available Grades & Equivalent Standards

Grade	Standard	Yield Strength (MPa)	Features
Q235B	GB/T 700	≥235	Chinese standard for general fabrication
SS400	JIS G3101	≥245	Popular structural grade in Asia
S235JR	EN 10025-2	≥235	European standard with impact test
ASTM A36	ASTM A36/A6	≥250	Widely used in U.S. machinery

Chemical Composition

Grade	C (%)	Mn (%)	Si (%)	P (%)	S (%)
Q235B	≤0.22	≤1.40	≤0.35	≤0.045	≤0.045
SS400	≤0.23	≤1.40	≤0.35	≤0.050	≤0.050
S235JR	≤0.20	≤1.60	≤0.55	≤0.035	≤0.035
A36	≤0.26	≤1.20	≤0.40	≤0.040	≤0.050

Mechanical Properties

Grade	Yield (MPa)	Tensile (MPa)	Elongation (%)
Q235B	≥235	370–500	≥26
SS400	≥245	400–510	≥21
S235JR	≥235	360–510	≥26
A36	≥250	400–550	≥20

Why Choose CJM for Carbon Machinery Steel?

• ✅ Global-Standard Inventory: Q235B / SS400 / S235JR / A36
• ✅ Cut-to-Length, CNC Cut, Beveling & Drilling Services
• ✅ ISO-Certified & 3.1 MTC Documentation
• ✅ Fast Containerized Shipment with multiple ports choices
• ✅ Multilingual Support for Technical & Commercial Inquiries

Buyer FAQs

• Can I weld Q235B or A36 for basic machine frames?
  Yes, these grades are highly weldable using MIG/TIG or arc welding with standard filler metals.
• Do these grades have mill test certificates (MTC)?
  Yes, CJM provides EN 10204 3.1 certificates and can arrange SGS or BV inspections.
• Are dimensional tolerances tight enough for CNC shops?
  Yes, plates are rolled to GB/T709 or ASTM A6 with strict thickness/flatness control.

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