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概述
ASTM A403 317L stub ends are wrought austenitic stainless steel butt-welded lap-joint fittings manufactured under ASTM A403 / A403M (Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings). A stub end is butt-welded to the end of a pipe and used in combination with a free-floating lap joint flange (backing flange) to form a flanged connection. 317L (UNS S31703) is a low-carbon, high-molybdenum (3.0–4.0%) austenitic stainless steel that provides significantly enhanced corrosion resistance over 316L, particularly in sulfuric acid, chloride-containing, and high-temperature process environments. The low-carbon grade (L, ≤0.030% C) ensures no intergranular corrosion after welding.
尺寸范围
- 1/2-24"
牌号标准
| 标准体系 | 数值 |
|---|---|
| 🇺🇸 UNS | S31703 |
| ASTM / ASME | A403 WP317L, A182 F317L, A312 TP317L, A240 Type 317L |
| 🇪🇺 EN | EN 1.4438 (X2CrNiMo18-14-4) |
| 🇩🇪 DIN | W-Nr. 1.4438, X2CrNiMo18-14-4, Werkstoff 1.4438 |
| 🇯🇵 JIS | SUS 317L, JIS G4303 (bars), JIS G4305 (sheet), JIS B2311 (butt-weld fittings) |
| 🇨🇳 GB | 00Cr19Ni13Mo3 (old) / 022Cr19Ni13Mo3 (new GB/T 20878) |
| 🇷🇺 GOST | 03Kh17N14M3, GOST 9941 (seamless pipe) |
| 🇦🇺 AS | AS 1528, AS 3679 Grade 317L, AS 4041 butt-weld fittings |
| AWS | ER317L (TIG/MIG), E317L (SMAW), A5.9 / A5.4 |
化学成分
| 元素 | 数值 |
|---|---|
| C | 0.030 |
| Mn | 2.00 |
| Si | 0.75 |
| P | 0.045 |
| S | 0.030 |
| Cr | 18-20 |
| Ni | 11-15 |
| Mo | 3-4 |
| Cu | 1 |
| Ni | 0.1 |
| Nickel + Copper (Ni + Cu) | 16 |
| Co | 0.2 |
| Ti | 0.1 |
| Nb | 0.1 |
| Fe | Remainder |
机械性能
| 性能 | 数值 |
|---|---|
| Tensile Strength, ksi (MPa) | 70 ksi (485 MPa) |
| Yield Strength @ 0.2% Offset, ksi (MPa) | 25 ksi (170 MPa) |
| Elongation in 2 in / 50 mm (%) | 30 |
物理性能
| 性能 | 单位 | 数值 |
|---|---|---|
| Density (g/cm³) | g/cm³ | 8.00 |
应用场景
- Chemical Processing
- Pulp & Paper (Primary Market for 317L)
- Flue Gas Desulfurization (FGD)
- Petroleum Refining & Petrochemical
- Pharmaceutical & Biotech (Electropolished Variants)
- Marine & Desalination
- Food Processing
- Power Generation
- Mining & Hydrometallurgy