| 材料 | S31803/S32750/S31500 | 标准： | ASTM A815 |
|---|---|---|---|
| 无损检测： | PT/HT/UT | 申请： | Off Shore/Marine/Shipping Building |
ASTM A815 S31803 Duplex Stainless Steel Seamless Tee Pipe Fitting B16.9
ASTM A815A815M-2001 Standard for Malleable Ferritic， Ferritic Austenitic， and Martensitic Stainless Steel Pipe fittings
S31803 属于双相不锈钢。22% 铬双相（奥氏体/铁素体）钢（2205 型），具有中等到较高的强度和良好的抗普通腐蚀/应力腐蚀/开裂性能。
这种合金能够耐受氯化物环境和硫化物应力腐蚀，其强度约为标准奥氏体不锈钢的两倍。当需要更高的机械强度/更轻的重量时，这种合金可以成功地替代 300 系列奥氏体不锈钢。F51 易于使用许多标准电弧焊设备进行焊接，但不建议用于氧气和乙烯块焊接，因为焊接金属可能会碳化。
S31803 duplex stainless steel is a kind of material with both ferrite and austenitic structure， its material performance is stable， has good corrosion resistance， strength and welding performance， and is widely used in petrochemical， Marine engineering， automobile， medical equipment and other fields.
S31803 duplex stainless steel pipe fittings have the following advantages:
1. It has good corrosion resistance and can operate safely in Marine environment， hydrochloric acid， sulfuric acid and other media.
2. With excellent strength and toughness， it can withstand high temperature and high pressure and impact load， greatly improving the safety and reliability of the pipeline system.
3. It has good processing performance and welding performance， which is convenient for processing and assembly in the production process.
4. It has good environmental performance and can greatly reduce production costs and environmental pollution.
Chemical Components
| 组成 | C | 锰 | P | S | Si | Cr | 倪 | 莫 | N |
| Max% | ≤0.030 | ≤2.00 | ≤0.030 | ≤0.020 | ≤1.00 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
不锈钢管件和法兰
| 美国标准A182/A182M | 锻造或轧制合金钢管道法兰、锻造管件和阀门以及高温服务部件。 |
| 美国标准A403/A403M | 锻造奥氏体不锈钢管件。 |
| 标准 A815/A815M | 锻造铁素体、铁素体/奥氏体和马氏体不锈钢管件。 |
| AS 2129 | 用于管道、阀门和配件的法兰 |
| ANSI/ASME B1.20.1 | 通用管螺纹（英制）。 |
| ANSI B16.5 | 钢管法兰和法兰配件。 |
| ANSI B16.9 | 工厂制造的锻钢对焊配件。 |
| ANSI B16.11 | 承插焊和螺纹锻钢配件。 |
| ANSI B16.25 | 对焊端头 |
| MSS SP43 | 锻造不锈钢对焊配件。 |
| BS21 | 穿线 |
| ISO 4144 | 不锈钢螺纹接头，符合 ISO 7-1 标准。
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