CJM High Strength Structural Steel Plates – Reliable Supply for Engineering Machinery Manufacturing

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.

Machinery Structural Steel Plate is mainly used in structural parts and wear-resistant parts of engineering machinery such as excavators, loaders, bulldozers, graders, cranes, concrete pump trucks, mining vehicles, road rollers, muck trucks, forklifts, and special vehicles. The product has high yield strength and fatigue strength, good low-temperature impact toughness, excellent cold formability and welding performance. CJM can produce steel for machinery manufacturing from Q235 to Q1300 according to domestic and international standards such as GB/T, EN, ASTM, JIS, and user technical requirements to meet users’ special requirements of “personalization + customization”.

Steel grade and dimension:

Steel Category	Steel Grade	Dimension (mm)			Standard	Delivery condition
		Thickness	width	Length
High strength steel	Q500MC~E  Q550MC~E  Q690MC~E	10~130	1050~4050	5000~23000	GB/T 1591	TMCP、TMCP+T
	Q460C~F、Q500C~F  Q550C~F、Q690C~F  Q890C~F、Q960C~F	6~150 6~150 6~60			GB/T 16270	QT
	Q1100D~E	10~30			GB/T 28909	QT
	Q500CFC~E  Q550CFC~E  Q690CFC~E	6~150			YB/T 4137	TMCP、TMCP+T QT
Wear resistant steel	NM360、NM400 NM450、NM500	6~60			GB/T 24186	QT
	22SiMn2、27MnTiB	8~80			Technical Agreement	AR
Saw blade steel	45Mn2V、75Cr、8CrV65Mn、25Mn4、40CrMnV	6.5~30			Technical Agreement	AR

Composition requirements of high strength steel in GB/T 1591 standard

SteelGrade	Quality Grade	Chemical Composition %
		Cb	Si	Mn	P	S	Nb	V	Tia	Cr	Ni	Cu	Mo	N	B	Alsb
		≤														≥
Q500M	C	0.18	0.60	1.80	0.030	0.030	0.01~0.11	0.01~0.12	0.006~0.05	0.60	0.80	0.55	0.20	0.015	0.004	0.015
	D				0.030	0.025								0.025
	E				0.025	0.020
Q550M	C	0.18	0.60	2.00	0.030	0.030				0.80		0.80	0.30	0.015
	D				0.030	0.025								0.025
	E				0.025	0.020
Q620M	C	0.18	0.60	2.60	0.030	0.030				1.00				0.015
	D				0.030	0.025								0.025
	E				0.025	0.020
Q690M	C	0.18	0.60	2.00	0.030	0.030				1.00				0.015
	D				0.030	0.025								0.025
	E				0.025	0.020

Composition requirements of high strength steel in GB/T 16270 standard

Steel Grade	Chemical Composition/%
	C	Si	Mn	P	S	Cu	Cr	Ni	Mo	B	V	Nb	Ti	CEVc
														thickness /mm
														≤ 50	> 50~100	> 100~150
Q460C  Q460D	0.20	0.80	1.70	0.025	0.015	0.50	1.50	2.00	0.70	0.005	0.12	0.06	0.05	0.47	0.48	0.50
Q460E  Q460F				0.020	0.010
Q500C  Q500D				0.025	0.015									0.47	0.70	0.70
Q500E  Q500F				0.020	0.010
Q550C  Q550D				0.025	0.015									0.65	0.77	0.83
Q550E  Q550F				0.020	0.010
Q620C  Q620D				0.025	0.015									0.65	0.77	0.83
Q620E  Q620F				0.020	0.010
Q690C  Q690D			1.80	0.025	0.015									0.65	0.77	0.83
Q690E  Q690F				0.020	0.010
Q890C  Q890D			2.00	0.025	0.015									0.72	0.82	–
Q890E  Q890F				0.020	0.010
Q960C  Q960D				0.025	0.015									0.82	–	–
Q960E  Q960F				0.020	0.010

Composition requirements of high strength steel in YB/T 4137 standard

Steel Grade	Quality Grade	Chemical Composition/%
		Ca	Si	Mn	P	S	Pcmb
		≤
Q500CF	C	0.09	0.50	1.80	0.025	0.015	0.20
	D				0.020	0.010
	E				0.020	0.010
Q550CF  Q620CF  Q690CF	C				0.025	0.015	0.25
	D				0.020	0.010
	E				0.020	0.010

Mechanical Properties:

Tensile properties of high strength steel of GB/T 1591 standard

Material Designation

Upper Yield Strength ReHa/MPa，≥

Tensile Strength Rm/MPa

Elongation after Fracture A/%≥

Steel Grade

Quality Grade

Thickness /mm

≤ 16

> 16~40

> 40~63

> 63~80

> 80~100

> 100~120

≤ 40

> 40~63

> 63~80

> 80~100

> 100~120

Q500M

C、D、E

500

490

480

460

450

–

610~720

600~760

590~750

540~730

–

17

Q550M

C、D、E

550

540

530

510

500

–

670~830

620~810

600~790

590~780

–

16

Q620M

C、D、E

620

610

600

580

–

–

710~880

690~880

670~860

–

–

15

Q690M

C、D、E

690

680

670

650

–

–

770~940

750~920

730~900

–

–

14

Mechanical Properties of High Strength Steel of GB/T 16270 Standard

Steel Grade	Tensile Test a Tensile Strength R /Mpa							Charpy V-notch Impact Test a
	Yield Strength bReH/Mpa，, ≥			m			Elongation after Fracture A/%≥	Test Temperature ℃	Minimum Average Impact Energy (Longitudinal Orientation) Akv ，J
	Thickness（mm）
	≤ 50	> 50~100	> 100~150	≤ 50	> 50~100	> 100~150
Q460C	460	440	400	550 ～ 720		500~670	17	0-20	47
Q460D
Q460E								-40-60	34
Q460F
Q500C	500	480	440	590 ～ 770		540~720	17	0-20	47
Q500D
Q500E								-40-60	34
Q500F
Q550C	550	530	490	640 ～ 820		590~770	16	0-20	47
Q550D
Q550E								-40-60	34
Q550F
Q620C	620	580	560	700 ～ 890		650~830	15	0-20	47
Q620D
Q620E								-40-60	34
Q620F
Q690C	690	650	630	770 ～ 940	760~930	710~900	14	0	47
Q690D								-20
Q690E								-40	34
Q690F								-60
Q890C	680	830	–	940 ～ 1100	880~1100	–	11	0	34
Q890D								-20
Q890E								-40	27
Q890F								-60
Q960C	960	–	–	980~1150	–	–	10	0	34
Q960D								-20
Q960E								-40	27
Q960F								-60

Why Choose CJM?

✓ Quality Assurance

• Strict mill selection process with long-term partnerships
• Batch-by-batch inspection:
  • Surface quality inspection (visual + automated scanning)
  • Mechanical property testing (tensile, hardness)

✓ Supply Chain Reliability

• Multiple qualified mills in our network for stable supply
• Ample inventory for fast delivery (10000+ tons standing stock)
• Real-time inventory tracking system
• Flexible MOQ (from trial orders to container loads)

✓ Trade Expertise

• 15+ years handling international logistics and documentation
• Professional export team familiar with:
  • CE, ASTM, JIS standards compliance
  • Country-specific import requirements

✓ Value-Added Services

• Custom cutting/slitting to customer specifications
• Professional export packaging

Key Features

• Uniform coating thickness with precision control
• Excellent formability and weldability
• Customizable surface treatments
• Various surface finishes available
• RoHS compliant and environmentally friendly

Applications

‌‌Construction Machinery‌

• Excavator booms
• Crane counterweights
• Bulldozer blades

‌Energy Equipment‌

• Wind turbine towers
• Hydropower gate structures
• Oil drilling platforms

‌Transportation Systems‌

• Railway wagon chassis
• Port machinery components
• Mining truck frames

‌Agricultural Machinery‌

Irrigation system supports‌

Combine harvester bases

Tractor load-bearing parts

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.)

Get a Quote Today

Contact Us for Current Machinery Structural Steel Plate Stock Availability.

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