ASTM A572 / EN S355JR / GB Q355B High-Strength Low-Alloy Steel Coil Technical Specifications
Material Classification & Global Equivalents
ASTM A572 defines four grades of HSLA (High-Strength Low-Alloy) steel optimized for structural efficiency.
Fabrication Advantages
- Formability
- Minimum bend radius: 0.8×T (cold forming)
- 15% better stretch-flangeability vs. carbon steel
- Welding Performance
- Preheat exemption: ≤32mm thickness (AWS D1.1)
- Consumables: E70xx (Gr.50), E80xx (Gr.60)
- Corrosion Resistance
- Atmospheric corrosion rate: 0.03mm/year (ISO 9223 C3)
- 2.5× paint adhesion vs. mild steel (ASTM D3359)
Certifications & Testing
- Mandatory
- EN 10204 3.1/3.2 certification
- Ultrasonic testing (ASTM A578 Class B)
- Optional
- HIC Test (NACE TM0284 for sour service)
- Z-direction properties (ASTM A770 ≥35% RA)
Available in coil dimensions:
- Thickness: 1.2-25.4mm
- Width: 600-2,500mm
- ID/OD: 508-1,600mm
Product Parameters
| Product Name | A572/S355JR Carbon Steel Coil |
| Production Process | Hot Rolling, Cold Rolling |
| Material Standards | AISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, GOST, SAE, etc. |
| Width | 45mm-2200mm |
| Length | Custom Size |
| Thickness | Hot Rolling: 2.75mm-100mm Cold Rolling: 0.2mm-3mm |
| Delivery Conditions | Rolling, Annealing, Quenching, Tempered or Standard |
| Surface Process | Ordinary, Wire Drawing, Laminated Film |
Chemical Composition
| A572 | C | Mn | P | S | Si |
| Grade42 | 0.21 | 1.35 | 0.03 | 0.03 | 0.15-0.4 |
| Grade50 | 0.23 | 1.35 | 0.03 | 0.03 | 0.15-0.4 |
| Grade60 | 0.26 | 1.35 | 0.03 | 0.03 | 0.40 |
| Grade65 | 0.23-0.26 | 1.35-1.65 | 0.03 | 0.03 | 0.40 |
Mechanical Properties
| A572 | Yield Strength(Ksi) | Tensile Strength(Ksi) | Elongation% 8inches |
| Grade42 | 42 | 60 | 20 |
| Grade50 | 50 | 65 | 18 |
| Grade60 | 60 | 75 | 16 |
| Grade65 | 65 | 80 | 15 |
Physical Performance
| Physical Performance | Metric | Imperial |
| Density | 7.80g/cc | 0.282 lb/in³ |
Scope of Application
ASTM A572 carbon steel low-alloy steel is widely used as bridge panels, support plates, mechanical mounting plates, etc. for construction equipment, transmission towers, racks and other equipment.
Equivalent Material
| EU | German Standard | Japanese Standard | French Standard | British Standard | Canada | Italy | Spain | National Standard | International | Portugal | India |
| EN | DIN, WNr | JIS | AFNOR | BS | HG | UNI | UNE | GB | ISO | NP | IS |
| S355JR | St52-3 | SM490A | E36-2 | 50B | 350W | Fe510B | AE355B | Q345B | E355C | FE510-B | IS961 |
| 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 |
