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Eternal
The ASTM A182 F304 austenitic stainless steel high-pressure gate valve forgings manufactured by Jiangyin Eternal Heavy Industry Co., Ltd. are specifically designed for the extreme environments of offshore platforms.
Designed to withstand the combined challenges of ultra-low temperatures of -196°C and high pressures ranging from Class 1500 to 2500, these forgings utilize a refined grain heat treatment process to address the structural instability (martensitic transformation) typically associated with conventional stainless steel under cryogenic conditions, while also meeting the requirements of NACE MR0175 for resistance to sulfide stress cracking (SSC) in acidic marine environments.
In accordance with the ASTM A182 / A182M-21 standard, the smelting analysis requirements for F304 forgings are as follows (percentages are by mass):
Element | Composition% | Element | Composition% |
C | ≤ 0.08 | P | ≤ 0.045 |
Mn | ≤ 2.00 | S | ≤ 0.030 |
Si | ≤ 1.00 | Cr | 18.0 – 20.0 |
Ni | 8.0 – 11.0 | Fe | Allowance (Bal.) |
PS:Grain Size Requirements: To meet deep-cold impact toughness requirements, the actual grain size of the supplied material is finer than ASTM Grade No. 6 (austenitic grains are stable, ensuring no brittle transition at -196°C).
The equivalent grades of F304 forgings under various national standards are as follows:
Region | Standard | GradeDesignation |
ISO | ISO 683-13 | X5CrNi18-10 |
USA | ASTM / UNS | S30400 (F304) |
EU / DIN | EN 10088-3 | 1.4301 (X5CrNi18-9) |
China / GB | GB/T 1220 | 06Cr19Ni10 |
JIS | JIS G3214 | SUS304 |
BS | BS 970 | 304S31 |
Property | Standard Value (ASTMA182) | Supply Value (Typical) |
Tensile Strength (Rm) | ≥ 515 MPa (75 ksi) | ≥ 570 MPa |
Yield Strength ( Rp0.2) | ≥ 205 MPa (30 ksi) | ≥ 260 MPa |
Elongation | ≥ 30 % | ≥ 45 % |
Reduction of Area | ≥ 40 % | ≥ 55 % |
Hardness (HBW) | ≤ 201 HBW | ≤ 190 HBW |
Impact @ -196℃ | ≥ 60J | Actual ≥ 80J |
Ultrasonic Testing (UT): 100% inspection in accordance with ASTM A388, with an acceptance level no lower than Level 2 as specified in ASME VIII Div. 1, Appendix U.
Magnetic Particle/Penetrant Testing (MT/PT): Surface and open defects are inspected in accordance with ASTM A275 and ASTM E165; linear defects are not permitted.
Intergranular Corrosion Testing: Conducted in accordance with ASTM A262 Method E to ensure the product’s corrosion resistance in seawater and chloride environments.
This F304 high-pressure gate valve forging is the preferred blank for the following demanding operating conditions:
Offshore Platforms (Topside & Subsea): Suitable for high-pressure manifold connections and subsea valve actuator fittings on platforms. Grade 304 exhibits excellent microstructural stability in liquid nitrogen and liquefied natural gas (LNG) environments at -196°C, far surpassing that of low-temperature carbon steel (LF2 limit: -46°C).
High-Pressure Fluid Handling: Class 1500–Class 2500 high-pressure steam (non-superheated) or high-pressure feedwater systems.
Refining, Petrochemicals, and Fine Chemicals: Resistant to corrosion from dilute nitric acid, organic acids, and various salt solutions; replaces rust-prone carbon steel forgings, significantly extending valve maintenance intervals.
End-to-End Traceability: Each batch is accompanied by a 3.1 Certificate of Conformity (EN 10204); 3.2 third-party inspection certification (including impact and hardness data) can be provided upon request.
Advantages of Large Cross-Sections: We can supply high-pressure gate valve forgings (valve body, bonnet, and gate) weighing up to 5,000 kg per piece, ensuring that the mechanical properties of the core in thick-walled sections meet standards and that there is no central porosity.
