Cryogenic & Nickel Steel Plate · cryogenic-service plate for LNG and ethylene storage tanks, air-separation cold boxes, and cryogenic transport and fuel tanks
1.1 This specification covers molybdenum-alloy steel plates, intended particularly for welded boilers and other pressure vessels. 1.2 Plates under this specification are available in three grades having different strength levels as follows: Strength Levels by Grade Grade Tensile Strength, ksi [MPa] A 65-85 [450-585] B 70-90 [485-620] C 75-95 [515-655] 1.3 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. 1.4 The values stated…
Specification text excerpt, reproduced for reference. Read the full ASME SA-204/SA-204M text →
| Element | Grade C |
|---|---|
| Carbon, max:A / Up to 1 in. [25 mm] incl, in thickness | 0.23 |
| Carbon, max:A / Over 1 in. to 2 in. [50 mm] incl, in thickness | 0.26 |
| Carbon, max:A / Over 2 in. to 4 in. [100 mm] incl, in thickness | 0.28 |
| Carbon, max:A / Over 4 in. [100 mm] in thickness | 0.28 |
| Manganese, max: / Heat analysis | 0.90 |
| Manganese, max: / Product analysis | 0.98 |
| Manganese, max: / Phosphorous, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon: / Heat analysis | 0.15–0.40 |
| Silicon: / Product analysis | 0.13–0.45 |
| Molybdenum: / Heat analysis | 0.45–0.60 |
| Molybdenum: / Product analysis | 0.41–0.64 |
Limits as specified in ASME SA-204/SA-204M. Where the standard sets different values by thickness or product analysis, each band is shown separately.
| Property | ksi |
|---|---|
| Tensile strength | 65-85 |
| Yield strength, min | 37 |
| Elongation in 8 in. [200 mm], min, %B | 19 |
| Elongation in 2 in. [50 mm], min, %B | 23 |
Mechanical requirements for the thickness ranges shown. Impact testing is carried out at the temperature specified for the grade.
SA204 Gr.A/B/C is normally specified for LNG and ethylene storage tanks, air-separation cold boxes, and cryogenic transport and fuel tanks.
We supply it cut to size by plasma, laser or waterjet, with edges machined or flame-cut to your drawing, and can deliver in the heat-treatment condition your fabrication procedure requires.
Quenched and tempered or normalized as specified, with impact testing at the service temperature of the grade carried out on each heat-treatment lot.
Full Charpy V-notch impact series at service temperature; EN 10204 3.1 / 3.2 mill test certificate; 9 % Ni plate supplied with qualified welding procedure support; UT to EN 10160 and PWHT simulation on request
Seaworthy packing — bottom skids, steel strapping, VCI film and edge protection — is standard for sea freight. Container loading plans with piece weights are issued before shipment.
Send the grade or the standard you specify, the thickness range, quantity and destination port. We reply with price, lead time, delivery term and the applicable certificate within 12 hours (Mon–Sat, GMT+8).
