A36 / A572 / S355 / S420 Plates for High-Rise Buildings, Industrial Frames & Infrastructure

Construction Steel Plates Introduction

Our high strength steel plates for construction are engineered for durable and safe building projects, offering superior performance in high-rise building frames, large-span industrial workshops, warehouse facilities, and landmark structures.

Specifications & Manufacturing Process

We provide construction steel plates in a wide range of sizes and production processes:

• Thickness range: 6–120 mm
• Width range: 1050–4050 mm
• Length range: 3000–23000 mm
• Surface finish: Mill finish, shot-blasted, painted, or galvanized
• Processing: Cutting, drilling, beveling, bending
• Delivery condition: AR / N / TMCP / QT

Advanced rolling and heat treatment processes ensure excellent weldability and dimensional accuracy for steel plates for construction projects.

Typical Grades and Standards for Construction Steel Plates

While Chinese engineering projects often use Q235GJ, Q345GJ, Q390GJ, Q420GJ, and Q460GJ grades, many international buyers are more familiar with European and American standards. The table below provides a quick comparison:

Chinese Standard (GB/T)	International Equivalent
Q235GJB / Q235GJC / Q235GJD / Q235GJE	ASTM A36 / S235JR
Q345GJB / Q345GJC / Q345GJD / Q345GJE	ASTM A572 Gr.50 / S355J2
Q390GJB / Q390GJC / Q390GJD / Q390GJE	ASTM A572 Gr.60 / S420NL
Q420GJB / Q420GJC / Q420GJD / Q420GJE	S420NL / ASTM A572 Gr.65
Q460GJB / Q460GJC / Q460GJD / Q460GJE	S460NL / ASTM A572 Gr.70
LY100 / LY160 / LY225	Custom engineering grades

Note: “GJ” in Chinese steel grades refers to “Construction” steel plate, specifically designed for building structures.

Steel Grade and Dimension

Steel Grade	Thickness (mm)	Width (mm)	Length (mm)	Standard	Delivery Condition
Q235GJB~E	6~150	1050~4050	5000~23000	GB/T 19879	WAR, WCR, N
Q345GJB~E	6~150				WAR, WCR, N, TMCP
Q390GJB~E Q420GJB~E Q460GJB~E	6~120				WCR, TMCP, N
LY100 LY160 LY225	8~70			GB/T 28905	WAR, WCR, N

Chemical Composition

Table 1 Chemical composition requirements

Grade	Quality Grade	Chemical Composition / %
		Cb	Si	Mnb	Pc	Sd	Vb	Nbb	Tib	Alsa	Cr	Cu	Ni	Mo
		≤			≤					≥	≤
Q235GJ	B、C	0.20	0.35	0.60  ~1.50	0.025	0.015	–	–	–	0.015	0.30	0.30	0.30	0.08
	D、E	0.18			0.020	0.010
Q345GJ	B、C	0.20	0.55	≤ 1.60	0.025	0.015	0.15	0.070	0.035				0.30	0.20
	D、E	0.18			0.020	0.010
Q390GJ	B、C	0.20		≤ 1.70	0.025	0.015	0.20		0.030				0.70	0.50
	D、E	0.18			0.020	0.010
Q420GJ	B、C	0.20			0.025	0.015					0.80		1.00	0.50
	D、E	0.18			0.020	0.010
Q460GJ	B、C	0.20			0.025	0.015		0.110			1.20	0.50	1.20	0.50
	D、E	0.18			0.020	0.010
LY100e	–	0.01	0.1	0.4	0.020	0.015	–	–	–	–	0.3	0.3	0.3	–
LY160e		0.03		0.5
LY225e		0.05		0.6
It is permissible to substitute the total aluminum content (Alt) for the acid-soluble aluminum content (Als) requirement, provided that the total aluminum content shall not be less than 0.02%. When V, Nb, or Ti is added individually in an amount not less than 0.015%, the minimum aluminum content requirement does not apply.When V, Nb, and Ti are added in combination, the total content (V+Nb+Ti) shall not exceed 0.15% for grades Q235GJ and Q345GJ, and shall not exceed 0.22% for grades Q390GJ, Q420GJ, and Q460GJ.For steel plates with through-thickness properties, the phosphorus (P) content shall not exceed 0.020%.For steel plates with through-thickness properties: For Z15 grade, the sulfur (S) content shall be ≤ 0.010%; For Z25 grade, the sulfur (S) content shall be ≤ 0.007%; For Z35 grade, the sulfur (S) content shall be ≤ 0.005%.

Table 2 CEV and Pcm

Grade	Delivery Condition a	Carbon Equivalent Value (CEV) / %			Weld Cracking Susceptibility Index (Pcm) / %
		≤50	>50~100	>100~150	≤50	>50~100	>100~150
		≤			≤
Q235GJ	WAR、WCR、N	0.34	0.36	0.38	0.24	0.26	0.27
Q345GJ	WAR、WCR、N	0.42	0.44	0.46	0.26	0.29	0.30
	TMCP	0.38	0.40	–	0.24	0.26	–
Q390GJ	WCR、N、NT	0.45	0.47	0.49	0.28	0.30	0.31
	TMCP、TMCP+T	0.40	0.43	–	0.26	0.27	~
Q420GJ	WCR、N、NT	0.48	0.50	0.52	0.30	0.33	0.34
	QT	0.44	0.47	0.49	0.28	0.30	0.31
	TMCP、TMCP+T	0.40	Mutual Negotiation	–	0.26	Mutual Negotiation	–
Q460GJ	WCR、N、NT	0.52	0.54	0.56	0.32	0.34	0.35
	QT	0.45	0.48	0.50	0.28	0.30	0.31
	TMCP、TMCP+T	0.42	Mutual Negotiation	–	0.27	Mutual Negotiation	–
a WAR；WCR；N；NT；TMCP；TMCP+T；QT。

Mechanical Properties

Grade

Quality Grade

Tensile Test

Longitudinal Impact Test

Bending Test a

Lower Yield Strength ReL / MPa

Tensile Strength Rm / MPa

Yield-to-Tensile Ratio (ReL/Rm)

Elongation after Fracture A / % ≥

Temperature / ℃

Impact Energy Absorption KV2/J ≥

THK（mm）

6~16

16~50

50~100

100~150

≤ 100

100~150

6~150

≤ 16

> 16

Q235GJ

B

≥ 235

235~345

225~335

215~325

400~510

380~510

≤ 0.80

23

20

47

D=2a

D=3a

C

0

D

-20

E

-40

Q345GJ

B

≥ 345

345~455

335~445

325~435

490~610

470~610

≤ 0.80

22

20

C

0

D

-20

E

-40

Q390GJ

B

≥ 390

390~510

380~500

370~490

510~660

490~640

≤ 0.83

20

20

47

C

0

D

-20

E

-40

Q420GJ

B

≥ 420

420~550

410~540

400~530

530~680

510~660

≤ 0.83

20

20

C

0

D

-20

E

-40

Q460GJ

B

≥ 460

460~600

450~590

440~580

570~720

550~720

≤ 0.83

18

20

C

0

D

-20

E

-40

LY100

–

100±20

–

200~300

–

0.60

50

0

27

–

–

LY160

–

160±20

–

220~320

–

0.76

45

–

–

LY225

–

225±20

–

300~400

–

0.78

40

–

–

Construction Steel Plates – Specific Requirements

Construction projects have unique performance demands for high strength construction steel plates:

• Flexural resistance: To maintain structural integrity under bending loads.
• Seismic resistance: High toughness to absorb seismic energy and prevent brittle fracture.
• Corrosion resistance: Suitable for coastal, humid, or polluted environments.
• Compliance with building codes: Plates conform to EN 10025 and ASTM A572 standards for construction applications.

Applications in Building Projects

Our steel plates for construction projects are widely used in:

• Landmark structures
• High-rise building frames
• Large-span industrial workshops
• Large-scale warehouse facilities

For other applications of high strength steel plates, such as bridges, heavy machinery, and wind towers, see our High Strength Structural Steel Plate page.

Why Choose CJM for Construction Steel Plates ?

• Optimized Plate Flatness and Weldability
• EN / GB / ASTM Multi-Standard Support
• Size Customization: Cut-to-Length, Drill, Bevel, CNC Cut
• Fast delivery: large inventory and efficient production scheduling
• Global export experience: serving Europe, Middle East, Southeast Asia, Africa and more

We ensure consistent mechanical performance and structural reliability to meet the needs of modern construction engineering.

Common Questions from Buyers

• Can these plates be used for welded structures with dynamic loading?
  Yes, grades like Q460C and S355J2 are suitable for dynamic stress structures with good ductility.
• What are the packaging and delivery options?
  CJM offers steel plate bundles with seaworthy packaging, full protection film, and markings per buyer’s instructions.
• Is inspection report included?
  Yes, Mill Test Certificate (EN 10204 3.1) and SGS/BV 3rd-party inspection are available.
• Can plates be surface-treated for corrosion protection?
  We offer pre-priming and anti-corrosion oiling. Galvanization needs Si content confirmation.
• Do you support small batch custom projects?
  Yes. Low MOQ and one-stop fabrication services available.

Maybe you are also interested in: Structural vs. Pressure Vessel Steel Plates: What’s the Difference?

Contact Us for Construction Steel Plate Quote

📞 WhatsApp: +8618191906640
✉️ 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