ASTM A203 Grade A/B/D/E/F Nickel Alloy Steel Plate: Cryogenic Performance & ASME Compliance
Material Overview & Core Advantages
ASTM A203 defines nickel-alloy pressure vessel steels engineered for -196°C cryogenic service and high-pressure containment systems. With nickel content from 2.03% (Grade A) to 3.82% (Grade F), these normalized plates meet ASME Section VIII requirements for critical energy infrastructure.
Key Benefits:
- Low-Temperature Toughness: 45J impact at -100°C (Grade D/F).
- Global Equivalents: EN 10028-4 P355NH (Grade A), JIS G3125 SPA-H (Grade E).
- Cost Efficiency: 20% savings vs. austenitic stainless steels.
Technical Specifications
1. Chemical Composition (ASTM A203M Standard)
| Grade | C ≤ | Ni | Mn ≤ | CEV* |
|---|---|---|---|---|
| Grade A | 0.23% | 2.03–2.57% | 0.88% | 0.38 |
| Grade D | 0.20% | 3.18–3.82% | 0.88% | 0.42 |
| Grade F | 0.23% | 3.18–3.82% | 0.88% | 0.46 |
| *CEV = C + (Mn + Ni)/20 |
2. Mechanical Properties
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Impact (-101°C) |
|---|---|---|---|---|
| Grade A | 255 | 450–585 | 23 | 34 J |
| Grade D | 255 | 450–585 | 23 | 45 J |
| Grade F | 345 | 515–690 | 20 | 52 J |
Physical Properties:
- Density: 7.80 g/cm³ (0.282 lb/in³)
- Thermal Expansion: 12.5 µm/m·°C (20–100°C)
Production & Fabrication
1. Manufacturing Methods
- Normalizing: 890–925°C treatment (mandatory for Grade D/F).
- Post-Weld Heat Treatment: 595–650°C × 1hr/25mm (ASME VIII).
2. Surface Treatments
| Process | Technical Parameters | Industry Use Case |
|---|---|---|
| Submerged Arc Welding | 2.5–4.0mm bead width (AWS A5.23) | LNG storage tanks |
| Passivation | 20% HNO3 dip (ASTM A967) | Pharmaceutical vessels |
Industrial Applications
1. Energy Sector
- LNG Spherical Tanks: Grade F plates (thickness 50–120mm, CEV ≤0.46).
- Hydrogen Compressors: Grade D forged shells (-196°C operation).
2. Chemical Processing
| Component | Material Grade | Operational Limits |
|---|---|---|
| Ethylene Reactors | Grade E | -110°C @ 15MPa |
| Ammonia Synthesis | Grade B | -50°C @ 25MPa |
3. Nuclear Power
- Containment Vessels: Grade F quenched plates (ASME N-3 certification).
- Heat Exchangers: Grade A seamless tubes (UT Class 1 examination).
Quality Assurance
- Testing Protocols:
- Charpy V-notch tests at -196°C (ASTM A370).
- PMI (Positive Material Identification) via XRF.
- Certifications:
- ASME U Stamp + U2 Form.
- PED 2014/68/EU Annex I.
Delivery & Storage
- Dimensions:
- Width: 1,500–3,200mm (max length: 15m).
- Thickness tolerance: ±0.15mm (cold-rolled), ±0.7% (hot-rolled).
- Packaging: Edge protectors + desiccant (18-month shelf life).
Welding Advisory: Use ENiCrMo-3 electrodes with 100–150°C preheat for Grade F*
Scope of Application
ASTM A203 boiler vessel plate is widely used in petroleum, chemical industry, power station, boiler and other industries, for the manufacture of reactor, heat exchanger, separator, spherical tank, oil and gas tank, high pressure pipeline, water turbine and other equipment and components.
| 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 |
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