Q355D / Q460C / S355J2 Plates for High-Rise Buildings, Industrial Frames & Infrastructure

Product Description

High strength steel plates have become a core material in today’s civil construction and infrastructure projects, delivering the performance and reliability demanded by modern structural designs. CJM supplies construction-grade structural steel plates such as Q355D, Q460C, and S355J2, widely used in high-rise buildings, stadiums, bridges, factories, and modular structures.

We offer a full range of High-Strength Structural Steel Plate, featuring high-strength, fire-resistant, and corrosion-resistant properties. Whether you need customized steel beams and columns or cost-effective steel solutions for tall structures, our premium materials ensure safety, durability, and outstanding performance for your project. Partner with us for reliable steel for high-rise building construction and bring your architectural vision to life.

Steel grade and dimension

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

–

–

Available Stock Sizes

14mm × 3000mm × 12500mm

17mm × 2400mm × 7000mm

24mm × 2200mm × 6300mm
(Custom sizes available upon request.)

Applications of Construction Grade Steel Plates

High-rise building steel is essential for the construction of modern skyscrapers and tall structures. It is widely used in:

1. Structural Framework: Steel beams, columns, and frames provide the primary support for tall buildings, ensuring strength and stability.
2. Fire and Corrosion Resistance: Steel is treated to withstand fire and corrosion, making it ideal for environments with high moisture or coastal exposure.
3. Seismic Resistance: Steel’s flexibility and strength make it a key material in earthquake-resistant designs, absorbing energy and reducing vibrations.
4. Facade and Cladding: Steel is used for building facades and decorative cladding, enhancing the aesthetic appeal and durability of high-rise buildings.
5. Flooring and Stairs: Steel floors, staircases, and platforms ensure strong, durable, and safe internal structures.
6. Building Expansion and Renovation: Steel is commonly used in building extensions, providing support for added weight or additional floors.
7. City Skyline Design: Steel shapes the modern skyline, allowing for innovative and unique architectural designs.

With its unmatched strength, fire resistance, and flexibility, high-rise building steel ensures the safety, durability, and aesthetic appeal of modern skyscrapers.

Why Choose CJM for Construction-Use Steel Plates?

• ✅ Optimized Plate Flatness and Weldability
• ✅ EN / GB / ASTM Multi-Standard Support
• ✅ Ultrasonic Tested (UT) Available on Request
• ✅ Shot Blasting + Shop Primer Options
• ✅ Size Customization: Cut-to-Length, Drill, Bevel, CNC Cut

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.

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