High Strength Low Alloy Cold Rolled Steel HC260LA-HC900LA

It is a kind of low carbon engineering structure steel that can be welded. Its carbon content has higher yield strength and better cold and hot working formability than ordinary carbon structural steel. It has good weldability, low cold and brittle tendency, notching and aging sensitivity, and good resistance to atmospheric and seawater corrosion.

Grade	YS Strength (MPa)	Tensile Strength (MPa) Not less than	Elongation A_80mm % Not less than	r90^°d,e	n90^°d	Bake Hardening^b,f (BH₂)
HC260LA^b	260~330	350~430	≥26	-	≥0.14	-
HC300LA^b	300~380	380~480	≥23	-	≥0.14	-
HC340LA^b	340~420	410~510	≥21	-	≥0.12	-
HC380LA^b	380~480	440~570	≥19	-	≥0.12	-
HC420LA^b	420~520	470~600	≥17	-	≥0.11	-
HC460LA^b	460~580	510~660	≥15	-	≥0.10	-
HC500LA^b	500~620	550~700	≥14	-	-	-
HC550LA^b	550~700	620	≥11	-	-	-
HC600LA^b	≥600	650~800	≥10	-	-	-
HC650LA^g	≥650	700~850	≥10	-	-	-
HC700LA^g	≥700	750~900	≥9	-	-	-
HC750LA^g	≥750	800~950	≥9	-	-	-
HC800LA^g	≥800	850~1000	≥8	-	-	-
HC850LA^g	≥850	900~1050	≥8	-	-	-
HC900LA^g	850~1050	980~1150	≥7	-	-	-

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

b The sample is P6 in GB/T 228.1, and the direction of the sample is transverse.

c When the nominal thickness of the product is greater than 0.50mm, but less than 0.70mm, the elongation after breaking is allowed to decrease by 2%; When the nominal thickness of the product is not more than 0.50mm, the elongation after breaking is allowed to decrease by 4%.

d r value, n value is only applicable to products with thickness not less than 0.50mm. When the nominal thickness of low alloy steel products is greater than 2.3mm, the n value regulation is no longer applicable.

e When the nominal thickness of the product is greater than 1.5mm, the r90 value is allowed to decrease by 0.2. When the nominal thickness of the product is greater than 2.5mm, the provisions of r90 are no longer applicable.

f When the thickness is greater than 1.2mm, the BH2 value shall be negotiated separately.

g The sample is P6 in GB/T 228.1, and the direction of the sample is longitudinal.

Grade	Chemical Component %
Grade	C	Mn	P	S	Alt	Si	Ti	Nb
HC260LA	≤0.10	≤1.0	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC300LA	≤0.12	≤1.4	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC340LA	≤0.12	≤1.5	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC380LA	≤0.12	≤1.6	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC420LA	≤0.12	≤1.6	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC460LA	≤0.14	≤1.8	≤0.030	≤0.025	≥0.010	≤0.5	≤0.15^d	≤0.09^d
HC500LA	≤0.14	≤1.8	≤0.030	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.09^d
HC550LA	≤0.14	≤1.8	≤0.030	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.09^d
HC600LA	≤0.14	≤2.0	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC650LA	≤0.14	≤2.0	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC700LA	≤0.14	≤2.0	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC750LA	≤0.14	≤2.0	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC800LA	≤0.14	≤2.0	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC850LA	≤0.14	≤2.5	≤0.025	≤0.025	≥0.010	≤0.6	≤0.15^d	≤0.10^d
HC900LA	≤0.15	≤2.8	≤0.025	≤0.025	≥0.010	≤0.8	≤0.16^d	≤0.10^d

a Partial or total substitution of Ti by Nb is allowed, in which case the total content of Nb and/or Ti should not exceed 0.20%.

b Partial or total substitution of Ti by Nb is allowed, in which case the total content of Nb and/or Ti should not exceed 0.12%.

c Nb can be replaced in part or in whole by Ti, and the total content of Ti and/or Nb is less than 0.10%.

d Ti and Nb can be added individually or in combination. V and B can also be added, and the total content of these alloying elements is less than 0.22%.