ZIZI ENGINEERING CO.,LTD
ZIZI ENGINEERING CO., LTD
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Stainless steel threaded coupling is one of our hot sale threaded pipe fittings, that is availabe in grade of 304, 316, 321, 317, 310. Since there are 3 pressure rating as 2000lb, 3000lb, 6000lb, we also call it as high pressure pipe fittings. It is used for small bore pipes and piping systems. Threaded pipe fittings are manufactured by forging and machining solid steel and are available in a multitude of shapes like elbows, tees, crosses, unions, caps,couplings. They are used only in conjunction with ASME Pipe and are available in the same size range. And where pipe-work is permanent and are designed to provide good flow characteristics.
Markings on BSP Threaded Coupling
Specification of Stainless Steel Threaded Coupling
| Speficiation | ASTM A182 / SASME A182, ASTM / ASME B16.11 |
| Size Range | 1/8" to 4" in Class 2000lb, 3000lb, 6000lb |
| Type | Straight Coupling, Reducing Coupling, Full Coupling, Half Coupling |
| Grades | ASTM A182 F304/304L/304H, F316/316L/316H, F321/321H, F347/347H, F310/310S |
| Thread Type | NPT, PT, BSPP, BSPT |
Standard for Stainless Steel NPT Coupling
ASME B16.11
This Standard covers ratings, dimensions, tolerances, marking and material requirements for socket-welding and Threaded Forged Fittings.
ASTM A182 / A182M
Standard Specification for Forged Fittings, and Parts for High-Temperature Service
ASTM A182 Stainless Steel Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
| F304 | 0.08 | 1.0 | 2.0 | 0.045 | 0.03 | 18 - 20 | 8.0 - 11.0 | - |
| F304H | 0.04 - 0.1 | 1.0 | 2.0 | 0.045 | 0.03 | 18 - 20 | 8.0 - 11.0 | - |
| F304L | 0.03 | 1.0 | 2.0 | 0.045 | 0.03 | 18 - 20 | 8.0 - 13.0 | - |
| F316 | 0.08 | 1.0 | 2.0 | 0.045 | 0.03 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 |
| F316H | 0.04 - 0.1 | 1.0 | 2.0 | 0.045 | 0.03 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 |
| F316L | 0.03 | 1.0 | 2.0 | 0.045 | 0.03 | 16.0 - 18.0 | 10.0 - 15.0 | 2.0 - 3.0 |
| F321 | 0.08 | 1.0 | 2.0 | 0.045 | 0.03 | 17.0 - 19.0 | 9.0 - 12.0 | - |
| F321H | 0.04 - 0.1 | 1.0 | 2.0 | 0.045 | 0.03 | 17.0 - 19.0 | 9.0 - 12.0 | - |
| F347 | 0.08 | 1.0 | 2.0 | 0.045 | 0.03 | 17.0 - 20.0 | 9.0 - 13.0 | - |
| F347H | 0.04 - 0.1 | 1.0 | 2.0 | 0.045 | 0.03 | 17.0 - 20.0 | 9.0 - 13.0 | - |
ASTM A182 Stainless Steel Mechnical Properties
| Grade | Tensile Strength (Mpa) | Yield Tensile (Mpa) | Elongation (%) | Hardness (HB) |
| F304 | 515 | 205 | 30 | - |
| F304H | 515 | 205 | 30 | - |
| F304L | 485 | 170 | 30 | - |
| F316 | 515 | 205 | 30 | - |
| F316H | 515 | 205 | 30 | - |
| F316L | 485 | 170 | 30 | - |
| F321 | 515 | 205 | 30 | - |
| F321H | 515 | 205 | 30 | - |
| F347 | 515 | 205 | 30 | - |
| F347H | 515 | 205 | 30 | - |
Stainless Steel Pipe Fittings Features