SA/A312 PIPE SPECIFICATION (TP304/L & TP316/L)
Scope
This specification covers seamless, straight-seam welded, and heavily cold worked welded stainless steel pipe intended for high-temperature and general corrosive service.
Process
Pipe to be manufactured Seamless, Welded or Heavily Cold Worked
Chemical Requirements
| Grade | UNS # | Content % by weight | |||||||
| Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Nickel | Molybdenum | ||
| TP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18 – 20 | 8 – 11 | x |
| TP304L | S30403 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18 – 20 | 8 – 13 | x |
| TP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16 – 18 | 10 – 14 | 2 – 3 |
| TP316L | S31603 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16 – 18 | 10 – 14 | 2 – 3 |
Permitted Variations in Wall Thickness
| Tolerance, % from Nominal | ||
| NPS Designator | Over | Under |
| ⅛ to 2½ incl., all t/D ratios | 20.0 | 12.5 |
| 3 to 18 incl., t/D up to 5% incl. | 22.5 | 12.5 |
| 3 to 18 incl., t/D > 5% incl. | 15.0 | 12.5 |
| 20 and larger, welded, all t/D ratios | 17.5 | 12.5 |
| 20 and larger, seamless, t/D up to 5% incl. | 22.5 | 12.5 |
| 20 and larger, seamless, t/D > 5% | 15.0 | 12.5 |
|
where: t = Nominal Wall Thickness D = Ordered Outside Diameter |
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- Exception for welded pipe: the weld area shall not be limited by the “Over” tolerance
Permitted Variations in Outside Diameter
| NPS Designator | Permissible Variations in Outside Diameter | DN Designator | Permissible Variations in Outside Diameter | ||
| Over in. |
Under in. |
Over [mm] |
Under [mm] |
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| ⅛ – 1½, incl | 1⁄64 (0.015) | 1⁄32 (0.031) | [6–40], incl | [0.4] | [0.8] |
| Over 1½ to 4, incl | 1⁄32 (0.031) | 1⁄32 (0.031) | Over [40 to 100] | [0.8] | [0.8] |
| Over 4 to 8, incl | 1⁄16 (0.062) | 1⁄32 (0.031) | Over [100 to 200] | [1.6] | [0.8] |
| Over 8 to 18, incl | 3⁄32 (0.093) | 1⁄32 (0.031) | Over [200 to 450] | [2.4] | [0.8] |
| Over 18 to 26, incl | ⅛ (0.125) | 1⁄32 (0.031) | Over [450 to 650] | [3.2] | [0.8] |
| Over 26 to 34, incl | 5⁄32 (0.156) | 1⁄32 (0.031) | Over [650 to 850] | [4.0] | [0.8] |
| Over 34 to 48, incl | 3⁄16 (0.187) | 1⁄32 (0.031) | Over [850 to 1200] | [4.8] | [0.8] |
Heat Treatment
All pipe shall be furnished in the heat-treated condition
Heat treat temperature for 304/L and 316/L is 1900 deg F (1040 deg C) minimum and then quenched in water or rapidly cooled.
Tensile Requirements
| GRADE 304 |
GRADE 304L |
GRADE 316 |
GRADE 316L |
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| Tensile Strength, minimum PSI | 75,000 | 70,000 | 75,000 | 70,000 | |
| Yield Strength, minimum PSI | 30,000 | 25,000 | 30,000 | 25,000 |
Hydrostatic or Nondestructive Electric Test
Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used will be at the option of the manufacturer unless otherwise specified in the purchase order.
Referenced Documents
ASTM Standards
- A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
- A370 Test Methods and Definitions for Mechanical Testing of Steel Products
- A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
- A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
- A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
- E112 Test Methods for Determining Average Grain Size
- E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
- E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
ASME Standards:
- B1.20.1 Pipe Threads, General Purpose
- B36.10M Welded and Seamless Wrought Steel Pipe
- B36.19 Stainless Steel Pipe
- ASME Boiler and Pressure Vessel Code: Section VIII4