English 
| Quantity: | |
|---|---|
Eternal
Jiangyin Eternal Heavy Industry Co.,Ltd specializes in hot forged seamless stainless steel pipe (W-H type) manufactured via integrated free forging + hot extrusion process, fully compliant with the latest national standard GB/T 14976-2025 (Seamless Stainless Steel Pipes for Fluid Transport) and international standard ASTM A312/A312M-24 Seamless Austenitic Stainless Steel Pipe.Applicable mediums: LNG liquefied natural gas, pure oxygen, chemical acid/alkali fluid, steam, seawater, oil & gas, high-pressure hydraulic medium, industrial circulating water
1. Forging eliminates internal shrinkage, segregation and inclusion, continuous metal flow line, superior impact & fatigue resistance for high-pressure fluid transmission
2. Supports extra-large OD & ultra-heavy wall custom sizes, zero weld leakage risk for corrosive, cryogenic & high-temperature media
3. Complete grade coverage: austenitic, ferritic, martensitic stainless steel; dedicated production for LNG low-temperature service & oxygen pipeline tubing
4. Online solution annealing after hot forming, full hydrostatic & ultrasonic NDT, optional internal polishing, full degreasing for oxygen service, fixed-length cutting & bevel processing
Metallic Structure | GB Grade | UNS Code | Equivalent ASTM Grade | Solution Annealing Process | Density (kg/dm³) |
Austenitic | 06Cr19Ni10 (304) | S30408 | TP304 | 1010~1150℃ rapid water quench | 7.93 |
Austenitic | 022Cr19Ni10 (304L) | S30403 | TP304L | 1010~1150℃ rapid water quench | 7.93 |
Austenitic | 06Cr17Ni12Mo2 (316) | S31608 | TP316 | 1010~1150℃ rapid water quench | 7.98 |
Austenitic | 022Cr17Ni12Mo2 (316L) | S31603 | TP316L | 1010~1150℃ rapid water quench | 7.98 |
Austenitic | 06Cr18Ni11Ti (321) | S32168 | TP321 | 920~1150℃ rapid cooling | 7.93 |
Super Austenitic | 015Cr21Ni26Mo5Cu2 (904L) | S39042 | N08904 | 1065~1150℃ water quench | 8.05 |
Ferritic | 06Cr13 | S11306 | TP405 | 800~900℃ slow cool /750℃ air cool | 7.75 |
Martensitic | 12Cr13 | S41010 | TP410 | 800~900℃ slow cool /750℃ air cool | 7.75 |
Material Grade | Min Tensile Strength (MPa) | Min Yield Strength Rp0.2 (MPa) | Min Elongation A (Longitudinal) |
304 / 06Cr19Ni10 | 520 | 205 | 35 |
304L / 022Cr19Ni10 | 480 | 175 | 40 |
316L / 022Cr17Ni12Mo2 | 480 | 175 | 40 |
321 / 06Cr18Ni11Ti | 520 | 205 | 35 |
06Cr13 Ferritic | 370 | 180 | 22 |
· Outer Diameter (OD): 20mm ~ 720mm (custom super large OD available)
· Wall Thickness (WT): 2mm ~ 200mm (heavy wall forged pipe core advantage)
· Standard Length: 4000mm ~ 12000mm; custom fixed length / multiple length / short cut pieces
· Delivery Mode: Nominal OD + nominal WT; nominal OD + minimum WT; nominal ID + nominal WT
Inspection Item | Sampling Rule | Test Standard | Acceptance Requirement |
Hydrostatic Pressure Test | 100% per pipe | GB/T 241 / ASTM A312 Clause 12 | Hold pressure ≥10s no leakage; Max 17MPa for OD≤88.9mm, max19MPa over 88.9mm |
Ultrasonic NDT | 100% per pipe | GB/T 5777 / ASTM A312 ET/UT | General pipe U3 grade; LNG & oxygen pipe upgrade U2.5 |
Tensile Test | 2 pipes per batch, 1 sample each | GB/T 228.1 / ASTM A370 | Meet minimum tensile & yield data in table above |
Intergranular Corrosion Test | 2 pipes per batch | GB/T 4334-2020 Method E / ASTM A262 S7 | No intergranular crack after sensitized test |
Flatten / Bend Test | 2 pipes per batch | GB/T 246 / GB/T 232 | D>400mm heavy forged pipe use 180° bend test instead of flattening |
-196℃ Charpy Impact (LNG/Oxygen Pipe) | 1 group 3 samples per batch | GB/T 14976 Appendix A/B | Meet minimum impact energy for sample thickness |
Surface Oil Residue Test (Oxygen Pipe) | Random sampling per batch | GB/T 14976 Appendix C | Surface oil residue ≤120mg/m² |
Visual Surface Inspection | 100% per pipe | GB/T 14976 Clause7.6 | No crack, fold, lamination; grinding depth ≤10% wall thickness |
We always focus on customers, pay attention to their needs, provide high-quality products and excellent services to meet their expectations.
ISO
TUV
CE
Industry Field | Typical Working Condition | Recommended Forged Stainless Pipe Grade |
Petrochemical Plant | High temp, acid & alkali corrosive fluid | 316L, 904L, 321 |
LNG Energy Storage & Transport | Cryogenic -196℃ low temperature | 304L, 316L (Appendix A spec) |
Oxygen / Gas Generation Plant | High purity oxygen pipeline, zero oil pollution | 304/316L full degreased pipe (Appendix B) |
Thermal Power Boiler | High temperature steam pipeline | 321, 310S |
Marine & Desalination | Seawater chloride corrosion resistant | 316L, Duplex 2205 forged pipe |
Heavy Hydraulic Machinery | Ultra high pressure thick wall cylinder barrel | 304, 06Cr13 |
Environmental Flue Gas Desulfurization | Strong acid waste fluid delivery | 316L, 904L |
