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Grade Chemical Componenta % C Si Mn P S HC250/450DP ≤0.15 ≤0.6 ≤2.5 ≤0.040 ≤0.015 HC290/490DP ≤0.15 ≤0.6 ≤2.5 ≤0.040 ≤0.015 HC340/590DP ≤0.15 ≤0.9 ≤2.5 ≤0.040 ≤0.015 B340/590DP ≤0.18 ≤0.9 ≤2.5 ≤0.040 ≤0.015 HC420/780DP ≤0.18 ≤0.9 ≤2.5 ≤0.040 ≤0.015 HC500/780DP ≤0.18 ≤0.9 ≤2.5 ≤0.040 ≤0.015 B420/780DP ≤0.23 ≤0.9 ≤2.5 ≤0.040 ≤0.015 HC550/980DP ≤0.23 ≤1.0 ≤3.0 ≤0.040 ≤0.015 HC650/980DP ≤0.23 ≤1.0 ≤3.0 ≤0.040 ≤0.015 HC700/980DP ≤0.23 ≤1.0 ≤3.0 ≤0.040 ≤0.015 HC820/1180DP ≤0.23 ≤1.0 ≤3.0 ≤0.040 ≤0.015 HC950/1310DP ≤0.23 ≤1.0 ≤3.0 ≤0.040 ≤0.015 HC1000/1470DP ≤0.28 ≤1.0 ≤3.0 ≤0.040 ≤0.015 a Al, Nb, Ti, Cr, Mo, B and other alloying elements can be added as required, and the total amount of these alloying elements is not more than 1.5% at this time.

Grade YS Strength (MPa) Tensile Strength (MPa) Elongation A50mm%  nb HC250/450DP 250~320 ≥450 ≥28 ≥0.16 HC290/490DP 290~390 ≥450 ≥26 ≥0.15 HC340/590DP 340~440 ≥590 ≥22 ≥0.14 HC420/780DP 420~550 ≥780 ≥15 - HC500/780DP 500~650 ≥780 ≥12 - HC550/980DP 550~720 ≥980 ≥9 - HC650/980DP 650~900 ≥980 ≥8 - HC700/980DP 700~920 ≥980 ≥8 - HC820/1180DP 820~1150 ≥1180 ≥5 - HC950/1310DP 950~1250 ≥1310 ≥5 - HC1000/1470DP 1000~1300 ≥1470 ≥5 - a When the yield phenomenon is not obvious, Rp0.2 is used; otherwise, ReL is used. b The sample is P17 as specified in GB/T 228.1, and the direction of the sample is transverse. If the user has special requirements can be negotiated to determine. c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 1%.

Grade	YS Strength(MPa)	Tensile Strength (MPa)	Elongation A50mm%			180° Bending Test Dia≥ (a=samplethickness)
			Thickness mm
			<1.0	1.0~1.6	≥1.6
B340/590DP	340~500	≥590	16	18	20	2a
B420/780DP	420~590	≥780	-	14	16	6a

a RP0.2 is used when the yield phenomenon is not obvious, and ReL is used.

b The sample is P17 as specified in GB/T 228.1, and the direction of the sample is transverse. If the user has special requirements can be negotiated to determine.

c The specified value of the bending test is applicable to the transverse specimen, the width of the bending specimen b≥35mm. The sample width during the arbitration test was 35mm. If the supplier can guarantee it, it may not carry out bending test.