Stainless Steel TP304H Tubes Properties and Character
ASTM A213 ASME SA213 TP304H Stainless Steel Tubes, ASTM A312 ASME SA 312 TP 304H Stainless Steel Pipe, EN 10216-5 1.4948 Stainless Steel Tubes in China. 304H stainless steel pipe is a variation of the 18% chromium – 8% nickel austenitic Alloy 304, in which the carbon content is controlled to a range of 0.04% – 0.1% (ASME SA213) to provide improved high temperature strength to parts exposed to temperatures above 1500°F (815°C).
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TP304H Stainless Steel Tubes Properties and Character
Unlike 304L, Type 304H has a higher carbon content making the steel more suitable for use in applications where elevated temperatures are present. It is an austenitic chromium-nickel steel alloy and the greater carbon content delivers an increased tensile strength and yield strength. The material is recommended for use in ASME pressure vessel in working service above 815 °C due to the grade’s heat resistant properties.
The higher carbon content of 304H increases its strength, so the ASTM A213 tensile strength and yield strength of 304H is greater than 304L. 304H has greater short term and long term creep strength than 304L at temperature up to 500 °C, and 304H is more resistant to sensitization than 304L. In ASME pressure vessel for use above 815 °C, the carbon content of 304H must be 0.04% – 0.1%. 304H is required in such applications.
Alloy 304H is most commonly used in petroleum refineries. It is also in Stainless Steel Reheater Tubes and Superheater Tubes for Boiler, heat exchanger tubes, condensers tubes, pipelines, cooling towers, steam exhausts, and electric generation plants. It will also be found in fertilizer and chemical plants.
Benefits of using TP304H Stainless Steel Pipe
- Higher carbon content gives the material greater heat resistant qualities
- Higher tensile strength and yield strength
- Greater short and long term creep strength
ASME SA 213 304 304L TP304H Chemical Composition
Table 1. Composition ranges for ASME SA 213 304 304L 304H and EN 10216-5 1.4301 1.4307 1.4948
| Grade | – | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 304/S30400 | min.max. | -0.08 | -2.0 | -1.00 | -0.045 | -0.030 | 18.0-20.0 | – | 8.0-11.0 | – |
| EN 10216-5 1.4301 | min.max. | -0.07 | -2.0 | -1.00 | -0.040 | -0.015 | 17.00-19.5 | – | 8.0-10.5 | -0.11 |
| 304L/S30403 | min.max. | -0.035 | -2.0 | -1.00 | -0.045 | -0.030 | 18.0-20.0 | – | 8.0-12.0 | – |
| EN 10216-5 1.4307 | min.max. | -0.030 | -2.0 | -1.00 | -0.040 | -0.015 | 17.5-19.5 | – | 8.0-10.0 | -0.11 |
| 304H /S30409 | min.max. | 0.04-0.10 | -2.0 | -1.00 | -0.045 | -0.030 | 18.0-20.0 | – | 8.0-11.0 | – |
| EN 10216-5 1.4948 | min.max. | 0.04-0.08 | -2.0 | -1.00 | -0.035 | -0.015 | 17.0-19.0 | – | 8.0-11.0 | -0. |
TP304H Stainless Steel Pipe Mechanical Properties
Typical mechanical properties for grade 304 stainless steels are given in table 2.
Table 2. 304H Stainless Steel Tubing Mechanical properties
| – | Tensile Strength | Yield Strength | Elongation | Hardness | Hardness |
| Grade | (MPa) min | 0.2% Proof (MPa) min | (% in 50mm) min | Rockwell B (HR B) max | Brinell (HB) max |
| 304 | 515 | 205 | 35 | 90 | 192 |
| 304L | 485 | 170 | 35 | 90 | 192 |
| 304H | 515 | 205 | 35 | 90 | 192 |
304H also has a requirement for a grain size of ASTM No 7 or coarser.
304H Stainless Steel Pipe Mechanical Properties (Tested By Guanyu Steel Tube According to ASME SA213 MW, OD 50.8mm, WT 2.11mm)
| UNS No | Grade | Yield Strength Rp0.2% (MPa) |
Tensile Strength (MPa) |
Elongation (%) |
Hardness HB Max | Hardness HRB Max |
| S30409 | TP304H | 273/285 | 589/597 | 54/55 | 149/153 | 83/84 |
TP304H Stainless Steel Physical Properties
Table 3. Physical properties of 304H grade stainless steel in the annealed condition
| – | Density | Elastic Modulus | Mean Coefficient of Thermal Expansion (mm/m/°C) | Mean Coefficient of Thermal Expansion (mm/m/°C) | Mean Coefficient of Thermal Expansion (mm/m/°C) | Thermal Conductivity (W/m.K) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C | Electrical Resistivity |
| Grade | (kg/dm³) | (GPa) | 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | (J/kg.K) | (nW.m) |
| 304/ 304L/ 304H |
7.93 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
304/304L/ TP304H Stainless Steel Standard Specification
Specification for 304/304L/304H grade stainless steel
| – | – | British | British | EN | EN | Swedish SS | Japanese JIS |
| Grade | UNS No | BS | En | No | Name | SS | JIS |
| 304 | S30400 | 304S31 | 58E | EN 10216 – 5 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
| 304L | S30403 | 304S11 | – | EN 10216 – 5 1.4307 | X2CrNi19-11 | 2352 | SUS 304L |
| 304H | S30409 | 304S51 | – | EN 10216 – 5 1.4948 | X6CrNi18-11 | – | – |
These comparisons are approximate only.
TP304H Stainless Steel Pipe Standards – ASTM A213/A269/A312 TP304H
ASTM/ASME: UNS S30409
EURONORM: FeMi35Cr20Cu4Mo2
DIN: 1.4948
304H Stainless Steel Pipe is commonly found in the oil refining, gas and chemical industry and is used in industrial boilers, pressure vessels, heat exchanger, pipelines and condensers. The material is also used throughout the power generation industry.
304H Stainless Steel ASTM Standards
| Bar | Butt Weld Fittings | Forgings | Pipe, Welded & Seamless | Welded Pipe | Seamless Steel Tube | Plate |
| A276, A479 | A403 | A182 | A312 | A249 | A213 | A240 |
| Standard Specification: | EN 10216-5, DIN 17456, DIN 17458, DIN 2462, DIN 17455 |
| GB/T14975, T14976, T13296, GB5310 | |
| ASTM A213, A269, A312, A511, A789, A790, A928, A999, A1016, ASTM B161, ASTM B163, ASTM B165, ASTM B167, ASTM B338, ASTM B407, ASTM B423, ASTM B444,ASTM B619, ASTM B622, ASTM B626, ASTM B668, ASTM B677, ASTM B829 | |
| JIS G3459, JIS G3463, JIS G3446, JIS G3447, JIS G3448, JIS G3468 | |
| GOST 9940,GOST 9941 |
TP304H Stainless Steel Pipe Applications
Alloy 304H is often used as a material of construction up to about 1500oF. Some examples of applications that Alloy 304H is commonly used for includes:
Most commonly useed in petroleum refineries
Stainless Steel Reheater Tubes and Superheater Tubes for Boiler
Heat exchanger
Condensers
Pipelines
Cooling towers
Steam exhausts
Electric generation plants
On occasion will be found in fertilizer and chemical plants
ASTM A312 TP304H Stainless Steel Pipe Size and Weight
| NPS | DN | OD inch |
OD mm |
SCH5S mm |
SCH10S mm |
SCH10 mm |
SCH20 mm |
SCH30 mm |
STD mm |
SCH40S mm |
SCH40 mm |
SCH60 mm |
XS mm |
SCH80S mm |
SCH80 mm |
SCH100 mm |
SCH120 mm |
SCH140 mm |
SCH160 mm |
XXS mm |
| 1/8 | 6 | 0.405 | 10.3 | 1.24 | 1.24 | 1.45 | 1.73 | 1.73 | 1.73 | 2.41 | 2.41 | 2.41 | ||||||||
| kgs/m | 0.280 | 0.280 | 0.320 | 0.369 | 0.369 | 0.369 | 0.474 | 0.474 | 0.474 | |||||||||||
| 1/4 | 8 | 0.540 | 13.7 | 1.65 | 1.65 | 1.85 | 2.24 | 2.24 | 2.24 | 3.02 | 3.02 | 3.02 | ||||||||
| kgs/m | 0.495 | 0.495 | 0.546 | 0.639 | 0.639 | 0.639 | 0.803 | 0.803 | 0.803 | |||||||||||
| 3/8 | 10 | 0.675 | 17.1 | 1.65 | 1.65 | 1.85 | 2.31 | 2.31 | 2.31 | 3.20 | 3.20 | 3.20 | ||||||||
| kgs/m | 0.635 | 0.635 | 0.703 | 0.851 | 0.851 | 0.851 | 1.108 | 1.108 | 1.108 | |||||||||||
| 1/2 | 15 | 0.840 | 21.3 | 1.65 | 2.11 | 2.11 | 2.41 | 2.77 | 2.77 | 2.77 | 3.73 | 3.73 | 3.73 | 4.78 | 7.47 | |||||
| kgs/m | 0.808 | 1.009 | 1.009 | 1.134 | 1.279 | 1.279 | 1.279 | 1.633 | 1.633 | 1.633 | 1.967 | 2.573 | ||||||||
| 3/4 | 20 | 1.050 | 26.7 | 1.65 | 2.11 | 2.11 | 2.41 | 2.87 | 2.87 | 2.87 | 3.91 | 3.91 | 3.91 | 5.56 | 7.82 | |||||
| kgs/m | 1.030 | 1.292 | 1.292 | 1.458 | 1.704 | 1.704 | 1.704 | 2.220 | 2.220 | 2.220 | 2.928 | 3.678 | ||||||||
| 1 | 25 | 1.315 | 33.4 | 1.65 | 2.77 | 2.77 | 2.90 | 3.38 | 3.38 | 3.38 | 4.55 | 4.55 | 4.55 | 6.35 | 9.09 | |||||
| kgs/m | 1.305 | 2.113 | 2.113 | 2.203 | 2.528 | 2.528 | 2.528 | 3.27 | 3.27 | 3.27 | 4.279 | 5.505 | ||||||||
| 1 1/4 | 32 | 1.660 | 42.2 | 1.65 | 2.77 | 2.77 | 2.97 | 3.56 | 3.56 | 3.56 | 4.85 | 4.85 | 4.85 | 6.35 | 9.70 | |||||
| kgs/m | 1.667 | 2.721 | 2.721 | 2.902 | 3.427 | 3.427 | 3.427 | 4.512 | 4.512 | 4.512 | 5.671 | 7.853 | ||||||||
| 1 1/2 | 40 | 1.900 | 48.3 | 1.65 | 2.77 | 2.77 | 3.18 | 3.68 | 3.68 | 3.68 | 5.08 | 5.08 | 5.08 | 7.14 | 10.15 | |||||
| kgs/m | 1.917 | 3.142 | 3.142 | 3.574 | 4.090 | 4.090 | 4.090 | 5.469 | 5.469 | 5.469 | 7.321 | 9.646 | ||||||||
| 2 | 50 | 2.375 | 60.3 | 1.65 | 2.77 | 2.77 | 3.18 | 3.91 | 3.91 | 3.91 | 5.54 | 5.54 | 5.54 | 8.74 | 11.07 | |||||
| kgs/m | 2.411 | 3.970 | 3.970 | 4.525 | 5.492 | 5.492 | 5.492 | 7.557 | 7.557 | 7.557 | 11.225 | 13.575 | ||||||||
| 2 1/2 | 65 | 2.875 | 73 | 2.11 | 3.05 | 3.05 | 4.78 | 5.16 | 5.16 | 5.16 | 7.01 | 7.01 | 7.01 | 9.53 | 14.02 | |||||
| kgs/m | 3.726 | 5.314 | 5.314 | 8.123 | 8.720 | 8.720 | 8.720 | 11.523 | 11.523 | 11.523 | 15.067 | 20.598 | ||||||||
| 3 | 80 | 3.500 | 88.9 | 2.11 | 3.05 | 3.05 | 4.78 | 5.49 | 5.49 | 5.49 | 7.62 | 7.62 | 7.62 | 11.13 | 15.24 | |||||
| kgs/m | 4.562 | 6.522 | 6.522 | 10.016 | 11.407 | 11.407 | 11.407 | 15.428 | 15.428 | 15.428 | 21.562 | 27.963 | ||||||||
| 3 1/2 | 90 | 4.000 | 101.6 | 2.11 | 3.05 | 3.05 | 4.78 | 5.74 | 5.74 | 5.74 | 8.08 | 8.08 | 8.08 | |||||||
| kgs/m | 5.229 | 7.487 | 7.487 | 11.528 | 13.706 | 13.706 | 13.706 | 18.823 | 18.823 | 18.823 | ||||||||||
| 4 | 100 | 4.500 | 114.3 | 2.11 | 3.05 | 3.05 | 4.78 | 6.02 | 6.02 | 6.02 | 8.56 | 8.56 | 8.56 | 11.13 | 13.49 | 17.12 | ||||
| kgs/m | 5.897 | 8.452 | 8.452 | 13.041 | 16.237 | 16.237 | 16.237 | 22.547 | 22.547 | 22.547 | 28.604 | 33.876 | 41.443 | |||||||
| 5 | 125 | 5.563 | 141.3 | 2.77 | 3.40 | 3.40 | 6.55 | 6.55 | 6.55 | 9.53 | 9.53 | 9.53 | 12.70 | 15.88 | 19.05 | |||||
| kgs/m | 9.559 | 11.679 | 11.679 | 21.986 | 21.986 | 21.986 | 31.281 | 31.281 | 31.281 | 40.684 | 49.612 | 58.012 | ||||||||
| 6 | 160 | 6.625 | 168.3 | 2.77 | 3.40 | 3.40 | 7.11 | 7.11 | 7.11 | 10.97 | 10.97 | 10.97 | 14.27 | 18.26 | 21.95 | |||||
| kgs/m | 11.422 | 13.966 | 13.966 | 28.548 | 28.548 | 28.548 | 42.992 | 42.992 | 42.992 | 54.752 | 68.247 | 80.020 | ||||||||
| 8 | 200 | 8.625 | 219.1 | 2.77 | 3.76 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 8.18 | 10.31 | 12.70 | 12.70 | 12.70 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 |
| kgs/m | 14.927 | 20.169 | 20.169 | 33.652 | 37.188 | 42.978 | 42.978 | 42.978 | 53.622 | 65.296 | 65.296 | 65.296 | 76.686 | 91.353 | 101.948 | 112.395 | 109.017 | |||
| 10 | 250 | 10.750 | 273.0 | 3.40 | 4.19 | 4.19 | 6.35 | 7.80 | 9.27 | 9.27 | 9.27 | 12.70 | 12.70 | 12.70 | 15.09 | 18.26 | 21.44 | 25.40 | 28.58 | 25.40 |
| kgs/m | 22.834 | 28.056 | 28.056 | 42.178 | 51.528 | 60.899 | 60.899 | 60.899 | 82.348 | 82.348 | 82.348 | 96.946 | 115.870 | 134.351 | 156.660 | 174.009 | 156.660 | |||
| 12 | 300 | 12.750 | 323.8 | 3.96 | 4.57 | 4.57 | 6.35 | 8.38 | 9.53 | 9.53 | 10.31 | 14.27 | 12.70 | 12.70 | 17.48 | 21.44 | 25.40 | 28.58 | 33.32 | 25.40 |
| kgs/m | 31.550 | 36.341 | 36.341 | 50.214 | 65.843 | 74.605 | 74.605 | 80.511 | 110.027 | 98.419 | 98.419 | 133.380 | 161.482 | 188.802 | 210.175 | 241.099 | 188.802 | |||
| 14 | 350 | 14.000 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 9.53 | 11.13 | 15.09 | 12.70 | 12.70 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | |
| kgs/m | 34.687 | 41.772 | 55.244 | 68.593 | 82.154 | 82.154 | 82.154 | 95.504 | 127.995 | 108.479 | 108.479 | 159.705 | 196.940 | 226.926 | 256.131 | 284.554 | ||||
| 16 | 400 | 16.000 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 9.53 | 12.70 | 16.66 | 12.70 | 12.70 | 21.44 | 26.19 | 30.96 | 36.53 | 40.49 | |
| kgs/m | 41.980 | 47.821 | 63.279 | 78.615 | 94.214 | 94.214 | 94.214 | 124.550 | 161.742 | 124.550 | 124.550 | 205.596 | 248.046 | 289.544 | 336.568 | 369.059 | ||||
| 18 | 450 | 18.000 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | 9.53 | 9.53 | 14.27 | 19.05 | 12.70 | 12.70 | 23.83 | 29.36 | 34.93 | 39.67 | 45.24 | |
| kgs/m | 47.282 | 53.870 | 71.315 | 88.637 | 123.672 | 106.273 | 106.273 | 157.446 | 207.918 | 140.621 | 140.621 | 257.251 | 312.904 | 367.420 | 412.595 | 464.249 | ||||
| 20 | 500 | 20.000 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.70 | 9.53 | 9.53 | 15.09 | 20.62 | 12.70 | 12.70 | 26.19 | 32.54 | 38.10 | 44.45 | 50.01 | |
| kgs/m | 59.918 | 69.340 | 79.350 | 118.333 | 156.692 | 118.333 | 118.333 | 185.281 | 250.340 | 156.692 | 156.692 | 314.329 | 385.394 | 445.968 | 513.266 | 570.541 | ||||
| 22 | 550 | 22.000 | 558.8 | 4.78 | 5.54 | 6.35 | 9.53 | 12.70 | 9.53 | 22.23 | 12.70 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | ||||
| kgs/m | 65.967 | 76.351 | 87.386 | 130.392 | 172.763 | 130.392 | 297.125 | 172.763 | 377.478 | 455.823 | 532.158 | 606.484 | 678.802 | |||||||
| 24 | 600 | 24.000 | 609.6 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | 9.53 | 9.53 | 17.48 | 24.61 | 12.70 | 12.70 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | |
| kgs/m | 83.361 | 95.421 | 95.421 | 142.452 | 211.619 | 142.452 | 142.452 | 257.825 | 358.619 | 188.833 | 188.833 | 446.255 | 552.875 | 646.065 | 726.927 | 815.817 | ||||
| 26 | 650 | 26.000 | 660.4 | 7.92 | 12.70 | 9.53 | 12.70 | |||||||||||||
| kgs/m | 128.726 | 204.904 | 154.512 | 204.904 | ||||||||||||||||
| 28 | 700 | 28.000 | 711.2 | 7.92 | 12.70 | 15.88 | 9.53 | 12.70 | ||||||||||||
| kgs/m | 138.748 | 220.975 | 275.048 | 166.571 | 220.975 | |||||||||||||||
| 30 | 750 | 30.000 | 762 | 6.35 | 7.92 | 7.92 | 12.70 | 15.88 | 9.53 | 12.70 | ||||||||||
| kgs/m | 119.528 | 148.770 | 148.770 | 237.046 | 295.143 | 178.631 | 237.046 | |||||||||||||
| 32 | 800 | 32.000 | 812.8 | 7.92 | 12.70 | 15.88 | 9.53 | 17.48 | 12.70 | |||||||||||
| kgs/m | 158.793 | 253.117 | 315.238 | 190.690 | 346.304 | 253.117 | ||||||||||||||
| 34 | 850 | 34.000 | 863.6 | 7.92 | 12.70 | 15.88 | 9.53 | 17.48 | 12.70 | |||||||||||
| kgs/m | 168.815 | 269.188 | 335.333 | 202.750 | 368.423 | 269.188 | ||||||||||||||
| 36 | 900 | 36.000 | 914.4 | 7.92 | 12.70 | 15.88 | 9.53 | 19.05 | 12.70 | |||||||||||
| kgs/m | 178.837 | 285.259 | 355.428 | 214.809 | 424.875 | 285.259 | ||||||||||||||
| 38 | 950 | 38.000 | 965.2 | 9.53 | 12.70 | |||||||||||||||
| kgs/m | 226.869 | 301.330 | ||||||||||||||||||
| 40 | 1000 | 40.000 | 1016 | 9.53 | 12.70 | |||||||||||||||
| kgs/m | 238.928 | 317.401 | ||||||||||||||||||
| 42 | 1050 | 42.000 | 1066.8 | 9.53 | 12.70 | |||||||||||||||
| kgs/m | 250.988 | 333.472 |
