ASTM A202 Grade A/B Pressure Vessel Steel: High-Temperature Specs & ASME Compliance
Material Overview & Core Advantages
ASTM A202 Grade A/B defines manganese-silicon alloy steel plates designed for boiler shells, pressure vessels, and high-temperature service up to 400°C. With thickness limits of 50mm (Grade A) and enhanced strength (Grade B), this material meets ASME Section VIII standards for critical containment systems.
Key Benefits:
- Creep Resistance: Stable tensile strength at 350°C (662°F).
- Global Equivalents: EN 10028-3 P265GH (Grade A), JIS G3115 SG255 (Grade B).
- Cost Savings: 15% lower lifecycle costs vs. chromium-moly alloys.
Technical Specifications
1. Chemical Composition (ASTM A202 Standard)
| Grade | C ≤ | Mn | Si | Cr | CEV* |
|---|---|---|---|---|---|
| Grade A | 0.17% | 0.97–1.52% | 0.54–0.96% | 0.31–0.64% | 0.41 |
| Grade B | 0.25% | 0.97–1.52% | 0.54–0.96% | 0.31–0.64% | 0.48 |
| *CEV = C + (Mn+Si)/6 + (Cr+Mo+V)/5 |
2. Mechanical Properties
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Impact (-10°C) |
|---|---|---|---|---|
| Grade A | 310 | 515–655 | 19 (50mm GL) | 27 J |
| Grade B | 325 | 585–760 | 18 (50mm GL) | 34 J |
Physical Properties:
- Density: 7.80 g/cm³ (0.282 lb/in³)
- Thermal Conductivity: 46 W/m·K (20°C)
Production & Fabrication
1. Manufacturing Methods
- Hot Rolling: Final thickness tolerance ±1.0% (ASTM A6/A6M).
- Stress Relieving: Mandatory for Grade B plates >25mm (595–675°C).
2. Surface Treatments
| Process | Technical Parameters | Industry Use Case |
|---|---|---|
| Post-Weld HT | 620°C × 1hr/mm (ASME BPVC) | Reactor vessel seams |
| Pickling | HNO3/HF bath (ASTM A380) | Food-grade tanks |
Industrial Applications
1. Energy Sector
- Steam Drum Shells: Grade A plates (thickness 12–40mm, PWHT required).
- Geothermal Separators: Grade B forged rings (CEV ≤0.48).
2. Chemical Processing
| Component | Material Grade | Operational Limits |
|---|---|---|
| Ammonia Converters | Grade B | 350°C @ 25MPa |
| Distillation Towers | Grade A | 280°C @ 15MPa |
3. Oil & Gas
- Wellhead Casings: Grade A seamless pipes (API 5L compliant).
- LNG Heat Exchangers: Grade B quenched plates (HB 180–220).
Quality Assurance
- Testing Protocols:
- Hydrostatic testing at 1.5× design pressure (ASME VIII Div.1).
- Ultrasonic examination (SA-435 Level II).
- Certifications:
- ASME Stamp with U3 Form.
- NACE MR0175 for sour service.
Delivery & Storage
- Dimensions:
- Width: 1,200–3,000mm (max length: 12m).
- Thickness tolerance: ±0.25mm (cold-rolled), ±0.8% (hot-rolled).
- Packaging: Polywrap + desiccant (36-month shelf life).
Welding Advisory: Use E7018 electrodes with 150–200°C preheat for Grade B*
Scope of Application
ASTM A202 boiler vessel plate is widely used in oil and gas engineering projects, for the manufacture of pressure vessels, boilers, storage tanks and heat exchangers and other equipment.
| 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 |
Product Show
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