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Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel
Standard Status:
This specification covers heat-treated carbon-manganese-silicon steel plates intended for fusion-welded pressure vessels and structures.
1.1 Applicable Classes
|
Class |
Heat Treatment |
Minimum Yield (MPa) |
Typical Applications |
|---|---|---|---|
|
Class 1 |
Normalized |
345 |
Moderate & lower temp service |
|
Class 2 |
Quenched & Tempered |
415 |
Low temp, high strength |
|
Class 3 |
Quenched & Tempered |
485 |
High strength, critical service |
1.2 Thickness Range
2. Referenced Documents
|
ASTM Standard |
Title |
|---|---|
|
A20/A20M |
General Requirements for Steel Plates for Pressure Vessels |
|
A435/A435M |
Straight-Beam Ultrasonic Examination |
|
A577/A577M |
Angle-Beam Ultrasonic Examination |
|
A578/A578M |
Acceptance Criteria for UT |
|
A770/A770M |
Through-Thickness Tension Testing |
3. General Requirements
All requirements of ASTM A20/A20M apply unless modified herein.
4. Materials and Manufacture
4.1 Steel Making Practice
4.2 Heat Treatment
|
Class |
Required Heat Treatment |
|---|---|
|
Class 1 |
Normalizedat 900–950°C (1650–1750°F), air cool |
|
Class 2 |
Quenchedin water from 845–900°C + Tempered ≥ 620°C |
|
Class 3 |
Quenchedin water from 845–900°C + Tempered ≥ 620°C |
5. Chemical Composition (Ladle Analysis)
Table 1: Chemical Requirements (%)
|
Element |
Class 1 |
Class 2 |
Class 3 |
|---|---|---|---|
|
Carbon, max |
0.24 |
0.24 |
0.24 |
|
Manganese |
0.70–1.35 (≤1.5" thick) 1.00–1.60 (>1.5") |
0.70–1.35 (≤1.5") 1.00–1.60 (>1.5") |
0.70–1.35 (≤1.5") 1.00–1.60 (>1.5") |
|
Phosphorus, max |
0.025 |
0.025 |
0.025 |
|
Sulfur, max |
0.025 |
0.025 |
0.025 |
|
Silicon |
0.15–0.50 |
0.15–0.50 |
0.15–0.50 |
|
Copper, max |
0.35 |
0.35 |
0.35 |
|
Nickel, max |
0.25 |
0.25 |
0.25 |
|
Chromium, max |
0.25 |
0.25 |
0.25 |
|
Molybdenum, max |
0.08 |
0.08 |
0.08 |
Product analysis tolerance: Per ASTM A20 Table 1 CE (IIW) = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 ≤ 0.45% (typical for weldability)
6. Mechanical Properties
Table 2: Tensile Requirements
|
Property |
Class 1 |
Class 2 |
Class 3 |
|---|---|---|---|
|
Tensile Strength, ksi (MPa) |
70–90 (485–620) |
80–100 (550–690) |
85–110 (585–760) |
|
Yield Strength, min, ksi (MPa) |
50 (345) |
60 (415) |
65 (485) |
|
Elongation in 2 in. (50 mm), min % |
22 |
22 |
20 |
|
Elongation in 8 in. (200 mm), min % |
18 |
18 |
16 |
Reduction of Area: Not required Test Direction: Transverse to rolling
7. Impact Toughness (Charpy-U or V-Notch)
|
Class |
Test Temp |
Min Avg (3 specimens) |
Min Single |
|---|---|---|---|
|
Class 1 |
– |
Not required |
– |
|
Class 2 |
–40°C (–40°F) |
20 ft-lbf (27 J) |
15 ft-lbf (20 J) |
|
Class 3 |
–50°C (–60°F) |
25 ft-lbf (34 J) |
20 ft-lbf (27 J) |
Optional: By agreement Specimen: 10×10 mm standard
8. Ultrasonic Examination (Optional)
9. Workmanship, Finish, and Appearance
10. Marking
Plates shall be legibly marked with:
Equivalent Standards & Cross-Reference
|
Standard |
Grade |
Notes |
|---|---|---|
|
EN 10028-3 |
P355NH, P460NL1 |
Similar chemistry |
|
ASME SA537 |
Class 1, 2, 3 |
Identical to ASTM |
|
JIS G3115 |
SPV450, SPV490 |
Japanese equivalent |
|
DIN 17102 |
WStE 460 |
German equivalent |
|
BS 1501 |
225-490A/B |
UK equivalent |
Heat Treatment Guidelines (Recommended)
|
Class |
Quench Temp |
Temper Temp |
Cooling |
|---|---|---|---|
|
Class 2 |
870–900°C |
620–680°C |
Water quench + air |
|
Class 3 |
870–900°C |
620–680°C |
Water quench + air |
PWHT (Post-Weld Heat Treatment): 580–620°C, 1 hr/inch
Typical Applications
|
Industry |
Use Case |
|---|---|
|
Oil & Gas |
LNG tanks, separators |
|
Petrochemical |
Reactors, columns |
|
Power Generation |
Boiler drums, HRSG |
|
Offshore |
Jackets, platforms |
Gangsteel A537 Stock & Supply (November 2025)
|
Class |
Thickness (mm) |
Width (mm) |
Length (m) |
MOQ (MT) |
Price (USD/MT) |
Stock (MT) |
|---|---|---|---|---|---|---|
|
Class 1 |
8–100 |
1500–3200 |
6–12 |
25 |
720–780 |
1200 |
|
Class 2 |
10–120 |
1500–3500 |
6–12 |
30 |
850–950 |
850 |
|
Class 3 |
12–100 |
1800–3000 |
6–12 |
50 |
980–1150 |
400 |
Services: Cutting, drilling, beveling, UT (EN 10160 S2E3), Z35, MTC 3.2 Lead Time: 7–15 days FOB Shanghai Certificates: ABS, DNV, LR, BV, KR
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