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Product Classification

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High-strength steel for automobiles（HSS）

High-strength steel (HSS) is widely used in the automotive industry, mainly to reduce vehicle weight, improve safety and fuel efficiency.

1.Classification by strength level

Categories	Y.S. (MPa)	T.S. (MPa)	Typical process	Representative brand
Normal High Strength Steel（HSS）	210-550	340-700	Hot rolling/cold rolling+micro alloying	Q345B (GB)、S355MC (EN)、SAPH440 (JIS)、A572 Gr.50 (ASTM)
Advanced High Strength Steel (AHSS)	550-1200	700-1500	Controlled rolling and controlled cooling/heat treatment	DP600/DP800 、TRIP600/TRIP800 、CP800
Ultra-high strength steel (UHSS)	≥1200	≥1500	Hot forming/quenching	MS1180/MS1500 、22MnB5、USIBOR®1500
热成形钢 (PHS)	1000-1500	1500-2000	Hot stamping + in-mold quenching	22MnB5+Coating、MBW®1700 (Zinc coating)

2. Chemical composition comparison (mass fraction, %)

Grade	C (≤)	Si (≤)	Mn (≤)	P (≤)	S (≤)
Q345B (GB)	0.2	0.5	1.7	0.035	0.035
S355MC (EN)	0.12	0.5	1.5	0.025	0.025
SAPH440 (JIS)	0.15	0.4	1.4	0.04	0.04
A572 Gr.50 (ASTM)	0.23	0.4	1.35	0.04	0.05

3. Physical performance comparison

Grade	Y.S. (MPa)	T.S. (MPa)	Elongation (%)	Impact energy (J, -20℃)	Hardness (HB)
Q345B	≥345	470-630	≥21	≥34	137-187
S355MC	≥355	430-580	≥18	≥27	120-180
SAPH440	≥305	440-590	≥26	-	≤170
A572 Gr.50	≥345	450-550	≥18	-	143-192

4.Main application scenarios

Grade	Typical Applications	Applicable process	Advantages
Q345B	Commercial vehicle frames, building steel structures, construction machinery	Welding, hot rolling	Low cost and sufficient supply
S355MC	Automobile chassis parts, truck longitudinal beams, cold-formed profiles	Cold stamping, roll forming	Low P/S, suitable for cold working
SAPH440	Door anti-collision beams, suspension arms, wheel spokes	Stamping, welding	High elongation, good formability
A572 Gr.50	Bridges, heavy truck frames, tower crane structures	Welding, riveting	High Nb/V content, excellent fatigue resistance

Product Details

We adopt high standard production processes, select high-quality steel raw materials, and provide diverse product specifications and models. All steel products have passed strict quality testing, with smooth and even surfaces, precise dimensions, excellent compressive strength, corrosion resistance, and processability. Support customized thickness, length, and special process requirements to meet different usage standards in different scenarios. Clear display of high-definition detailed images and technical parameter tables of the physical object, ensuring transparent and visible quality.

Packaging and Shipping

Adopting a professional industrial packaging solution that is moisture-proof and scratch resistant, each batch of steel is tied and fixed with customized wooden frames/steel strips, combined with anti rust coatings and cushioning pads to ensure zero damage during transportation. Clear product model, batch number, and storage identification on the outer packaging, supporting customized enterprise logos and information labels. Environmentally friendly and recyclable packaging materials practice green concepts, reducing transportation and disassembly costs.

Partners

The company has sufficient inventory, supports customization, and has complete varieties and specifications.

Now we can provide 1000,000 tons for the clients all over the world every year.

Certificate Qualification

Shandong Zhongxuan Steel Group Co.,Ltd. Is a modern integrated production enterprise which incorporates the processing & manufacturing of Cold rolled Steel, Hot rolled steel, Galvanized Steel, Galvalume Steel, and Prepainted Steel Products, sales and logistics.