A588 Carbon Steel Plate

ASTM A588 defines ‌four structural steel variants‌ for atmospheric corrosion resistance: ‌Grade A‌: Base composition with enhanced phosphorus content (≤0.04%) ‌Grade B‌: Modified copper-nickel-chromium alloy system ‌Grade C‌: Optimized for welded structures (Ceq ≤0.47) ‌Grade K‌: Thin-section plates (<19mm) with accelerated protective patina

‌ASTM A588 Carbon Steel Plate: High-Strength Weathering Steel Technical Profile‌

‌Material Classification & Specifications‌

ASTM A588 defines ‌four structural steel variants‌ for atmospheric corrosion resistance:

‌Grade A‌: Base composition with enhanced phosphorus content (≤0.04%)
‌Grade B‌: Modified copper-nickel-chromium alloy system
‌Grade C‌: Optimized for welded structures (Ceq ≤0.47)
‌Grade K‌: Thin-section plates (<19mm) with accelerated protective patina

Compliant with ‌ASTM A588/A588M-22‌ and ‌AASHTO M 183‌ standards for bridge/structural applications.

Product Parameters

Product Name	A588 Carbon Steel Plate
Production Process	Hot Rolling, Cold Rolling
Material Standards	AISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, GOST, SAE, etc.
Width	100mm-3000mm
Length	1m-12m, or Customized Size
Thickness	0.1mm-400mm
Delivery Conditions	Rolling, Annealing, Quenching, Tempered or Standard
Surface Process	Ordinary, Wire Drawing, Laminated Film

Chemical Composition

A588	C	Mn	P	S	Ni	Si	Cr
GradeA	≤ 0.19	0.80~1.25	≤ 0.04	≤ 0.05	≤ 0.40	0.30-0.65	0.40-0.65
GradeB	≤ 0.20	0.75~1.35	≤ 0.04	≤ 0.05	≤ 0.50	0.15-0.50	0.40-0.70
GradeC	≤ 0.15	0.80~1.35	≤ 0.04	≤ 0.05	0.25-0.50	0.15-0.40	0.30-0.50
GradeK	≤ 0.17	0.50~1.20	≤ 0.04	≤ 0.05	≤ 0.40	0.25-0.50	0.40-0.70

Mechanical Properties

A588	Tensile Strength	Yield Strength	Elongation 200mm%	Elongation 50in%
Thickness≤100mm	485	345	18	21
Thickness>100-125mm	460	315	–	21
Thickness>125-200mm	435	290	–	21

Physical Performance

Physical Performance	Metric	Imperial
Density	7.75g/cc	0.280 lb/in³

Scope of Application

ASTM A588 steel is known for its weather resistance. When exposed to external conditions, its corrosion resistance becomes stronger even if it is not painted. ASTM A588 steel has four times the corrosion resistance of carbon steel. The application of ASTM A588 steel is very wide. In addition to its typical application in welded bridges and buildings, this specification is also widely used in railway passenger cars; including transmission towers and telephone towers, trucks, bridges and gusset plates, and housing shells. ASTM A588 steel also maintains a good strength-to-weight ratio, meeting the high strength requirements of carbon steel with less weight.

China	USA	Germany	Japan	France	U.K.	internationality
GB3077	AlSI	DIN	JIS	NE	BS	ISO
20Mn2	1320 1221	20Mn5	SMn21	20M5	150M19	–
30Mn2	1330	30Mn5	SMn24	32M5	150M28	–
35Mn2	1335	36Mn5	SMnl	35M5	150M36	–
40Mn2	1340 1341	–	SMn2	40M5	–	–
45Mn2	1345	46Mn7	SMn3	45M5	–	–
50Mn2	1052	50Mn7	–	55M5	–	–
20MnV	–	20MnV6	–		–	–
30Mn2MoW	–	—	–		–	–
27SiMn	–	27MnSi5	–		–	–
35SiMn	–	37MnSi5	–	38MS5	–	–
42SiMn	–	38MnSi4 46MnSi4	–	38MS5	–	–
20SiMn2MoV	–	–	–	–	–	–
25SiMn2MoV	–	–	–	–	–	–
37SiMn2MoV	–	–	–	–	–	–
40B	14B35	35B2	–	–	–	–
45B	50B46H	45B2	–	–	–	–
50B	14B50	–	–	–	–	–
4OM∏B	15B41	–	–	–	–	–
45MnB	15B48 50B44	–	–	–	–	–
20Mn2B	–	–	–	–	–	–
20MnMoB	80B20	–	–	–	–	–
15MnVB	–	–	–	–	–	–
–	–	–	–	–	–	–
–	–	–	–	–	–	–
20MnVB	–	–	–	–	–	–
40MnVB	–	–	–	–	–	–
20MnTiB	–	–	–	–	–	–
25MnTiBRE	–	–	–	–	–	–
2OSiMnVB	–	–	–	–	–	–
15Cr	5015 5115	15Cr3	SCr21	12C3	523A14 523M15	–
15CrA	–	–	–	–	–	–
20Cr	5120	20Cr4	SCr22	18C3 18C4	527A19 527M20	683/11 20Cr4 20CrS4
30Cr	5130	28Cr4	SCr2	28C4 32C4	530A30 530A32	–
35Cr	5135	34Cr4 37Cr4	SCr3	38C4	530A36	683/8 3、 3a、 3b
40Cr	5140	38Cr4 41Cr4	SCr4	42C4	530A40 530M40	683/1 4、 4a^ 4b
45Cr	5145	42Cr4	SCR5	45C4	–	–
50Cr	5150 5152	–	–	50C4	En48	–
38CrSi	–	–	–	–	–	–
12CrMo	4119	13CrMo44	–	12CD4 15CD2	–	–
15CrMo	ASTM A-387Gr. B	15CrMo5 16CrMo44	SCM21	15CD4. 05	BS1653	–
20CrMo	4118	20CrMo5 22CrMo4	SCM22	18CD4 20CD4	CDS 12 CDSllO	–
30CrMo	4130	25CrMo4	SCM2	30CD4	CDS 13	–
30CrMoA	–	32CrMol2 3ICRMo12	–	–	–	–
35CrMo	4135 4137	34CrMo4 35CrMo4	SCM3	35CD4	78A37	683/1 C35ea C35eb
42CrMo	4140 4142	41CrMo4 42CrMo4	SCM4	40CD4 42CD4	708M40 708A42 709M40	683/1 3
12CrMoV	–	–	–	–	–	–
35CrMoV	–	35CrMoV5	–	–	–	–
12CrlMoV	–	13CrMoV4.2	–	–	–	–
25Cr2MoVA	–	24CrMoV5.5	–	–	–	–
25Cr2MolVA	–	–	–	–	–	–
20CR3MoWVA	–	21CrVMoW12	–	–	–	–
38CrMoΛl	6370 (ΛMS)	34CrAlMo5 41CrAlMo7	SACM645	40CAD6.12	905M39	683/10 41CrAlMo74
20CrV	6120	22CrV4	–	22CrV4	–	–
40CrV	6140	42CrV	–	42CrV4	–	–
50CrVA	6150	50CrV4	SUPlO	50CV4	735A50	–
15CrMn	–	16MnCr5	–	16MC5	–	–
20CrMn	5120	20MnCr5	SMC21	20MC5	–	–
40CrMn	5140	–	SMC3	–	–	–
20CrMnSi	–	–		–	–	–
25CrMnSi	–	–	SMKl	–	–	–
30CrMnSi	–	–	–	–	–	–
30CrMnSiA	–	–	–	–	–	–
35CrMnSiA	–	–	SMK2	–	–	–
20CrMnMo	4119	20CrMo5	SCM23	–	–	–
40CrMnMo	4140	–	–	–	–	–
20CrMnTi	–	–	SMK22	–	–	–
30CrMnTi	–	30MnCrTi4	–	–	–	–
20CrNi	3120	20NiCr6	–	20NC6	637A16 637M17	–
40CrNi	3140	46NiCr6	SNCl	35NC6	640A35 640M40	–
45CrNi	3145	45NiCr6	–	–	–	–
50CrNi	3150	–	–	–	–	–
12CrNi2	3115	14NiCrlO	SNC21	IONCll 14NC11	–	–
12CrNi3	3310	13NiCrl2	SNC22	10NC12 14NC12	655A12 655M13	–
20CrNi3	–	22NiCrl4	–	20NC11	–	–
30CrNi3	–	28NiCrlO 31NiCrl4	SNC2	30NC11 30NC12	–	–
37CrNi3	–	35NiCrl8	SNC3	35NC15	–	–
12Cr2Ni4	E3310	14NiCrl8	–	12NC15	–	–
20Cr2Ni4	E3316	22NiCrl4	–	20NC14	659A15 659M15	–
20CrNiMo	8620 8720	20NiCrMo2 21NiCrMo2	–	20NCD2	805A20 805M20	–
40CrNiMoA	4340 9840	36NiCrMo4 40NiCrMo6	SNCM8	35NCD5 40NCD3	817M40 816M40	–
45CrNiMoVA	4437	–	SNCM9	–	–	–
18Cr2Ni4WA
25Cr2Ni4WA