ASTM A688 TP304/304L/304LN , TP316/316L/316LN Welded Austenitic Stainless Steel Feed warter Heater Tubes
Size range:
O.D.: 4.0-230mm W.T.:1-30mm L: according to customer requirement
Material and Manufacture:
Tubes are made from Flat-rolled steel by automatic welding process.
Subsequent to welding and prior to final heat treatment, the tubes are cold drawn or cold rolled
The tubes are ready for U-bending after annealed, according to customer's drawing and design.
Surface Condition:
The tubes are pickled in nitric and hydrofluoric acids.
Bright annealing.
Mechanical Requirement
| Grade: | TP304 | TP304L | TP304LN | TP316 | TP316L | TP316LN | TP316LN | TPXM-29 | TP304N |
| UNS | S30400 | S30403 | S30453 | S31600 | S31603 | S31653 | S31653 | S24000 | S30451 |
| C, max | 0.08 | 0.035 | 0.035 | 0.080 | 0.035 | 0.035 | 0.035 | 0.08 | 0.080 |
| Mn, max | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 11.5-14.5 | 2.00 |
| P, max | 0.045 | 0.045 | 0.045 | 0.045 | 0.045 | 0.045 | 0.045 | 0.060 | 0.045 |
| S, max | 0.030 | 0.030 | 0.030 | 0.030 | 0.030 | 0.030 | 0.030 | 0.030 | 0.030 |
| Si, max | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Ni | 18.0-20.0 | 18.0-20.0 | 18.0-20.0 | 16.0-18.0 | 16.0-18.0 | 16.0-18.0 | 16.0-18.0 | 17.0-19.0 | 18.0-20.0 |
| Cr | 8.0-11.0 | 8.0-13.0 | 8.0-12.0 | 11.0-14.0 | 10.0-14.0 | 11.0-14.0 | 11.0-14.0 | 2.3-3.7 | 8.0-18.0 |
| Mo | … | … | … | 2.00-3.00 | 2.00-3.00 | 2.00-3.00 | 2.00-3.00 | … | … |
| Nitrogen | … | … | … | … | … | … | … | … | … |
| Copper | … | … | … | … | … | | | | |
| Grade: | TP316N | … | … | … | … |
| UNS | S31651 | N08367 | N08926 | S31254 | S32654 |
| C, max | 0.070 | 0.030 | 0.020 | 0.020 | 0.020 |
| Mn, max | 2.00 | 2.00 | 2.00 | 1.00 | 2.0-4.0 |
| P, max | 0.045 | 0.040 | 0.030 | 0.030 | 0.030 |
| S, max | 0.030 | 0.030 | 0.010 | 0.100 | 0.005 |
| Si, max | 4.8-6.0 | 1.00 | 0.50 | 0.80 | 0.50 |
| Ni | 9.58.0 | 20.0-22.0 | 24.0-26.0 | 19.5-20.5 | 21.0-23.0 |
| Cr | 19.0-22.0 | 23.5-25.5 | 19.0-21.0 | 17.5-18.5 | 24.0-25.0 |
| Mo | 0.30-1.50 | 6.0-7.0 | 6.0-7.0 | 6.0-6.5 | 7.0-8.0 |
| Nitrogen | … | … | … | … | 0.45-0.55 |
| Copper | … | … | … | | 0.30-0.60 |
Tensil Requirements
| Grade and UNS | Tensile strength
min ksi [Mpa] | Yield strength
min ksi [Mpa] | Elongation
in 2in or 50mm min % |
304, 316
S30400, S31600 | 75 [515] | 30 [205] | 35 |
304L, 316L
S30403, S31603 | 70 [485] | 25 [175] | 35 |
XM-29
S24000 | 100 [690] | 55 [380] | 35 |
304N, 316N
S30451, S31651 | 80 [550] | 35 [240] | 20 |
304LN, 316LN
S30453, S31653 | 75 [515] | 30 [205] | 35 |
| N08367 t≤0.187 | 100 [690] | 45 [310] | 30 |
| N08367 t＞0.187 | 95 [655] | 45 [310] | 30 |
| N08926 | 94 [650] | 45 [310] | 35 |
| S31254 t≤0.187 | 100 [690] | 45 [310] | 35 |
| S21254 t＞0.187 | 95 [655] | 45 [310] | 35 |
| S32654 | 120 [825] | 65 [450] | 40 |
Permissible Variations in Dimensions
| Group | Size,
Outside Diameter,
in(mm) | Permissible
Variations in
Outside Diameter,
in.[mm] | Permissible
Variations in WT, % | PermisibleVariations in Cut Length,
in[mm]Over Under |
| 1 | Up to 1/2(12.7), excl | ±0.005[0.13] | ±15 | 1/8[3] | 0 |
| 2 | 1/2 to 1 1/2(12.7 to 38.1 excl | ±0.005[0.13] | ±10 | 1/8[3] | 0 |
| 3 | 1 1/2 to 3 1/2(38.1 to 88.9 excl | ±0.010[0.25] | ±10 | 3/16[5] | 0 |
| 4 | 3 1/2 to 5 1/2(88.9 to 139.7 excl | ±0.015[0.38] | ±10 | 3/16[5] | 0 |
| 5 | 5 1/2 to 5 1/2(139.7 to 230.2 excl | ±0.030[0.76] | ±10 | 3/16[5] | 0 |
Reference Documents:
ASTM STANDARDS
ASTM A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
ASTM A480 / A480 M Specification for General Requirements for Flat-Rolled Stainless and Heat-
Resisting Steel Plate, Sheet and Strip,
ASTM A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys.
ASTM A1016/ A1016 M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy
Steels, and Stainless Steel Tubes.
ASTM E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
SAE J1086 Practice for Numbering Metals and Alloys (UNS)
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