Yosun (Tianjin) Piping Engineering Co., Ltd. is one of the most credible manufacturers and suppliers of seamless tubes of heat-resistant steels in China. Please feel free to wholesale customized seamless tubes of heat-resistant steels at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.
‖ Limits governing the application of qualitu grades Ⅰand Ⅲ
| Quality grade1) | Outside diameter | ||||
| ≤63.5 mm | ＞63.5 mm | ||||
|
Temperature 2) ℃ |
Permissible working pressure 3) bar |
Temperature 2) ℃ |
Permissible working pressure 3) bar |
||
| Ⅰ | ≦450 | ≦80 | ≦450 | ≦32 | |
| Ⅲ | ＞450 | ＞80 | ＞450 | ＞32 | |
|
1) If pressure and temperature date do not belong to the same group the higher gruop applies. 2) Temperature of conveyed fluid. 3) See DIN 2401 Part 1. |
|||||
‖ Reference date for hot forming,normalising and hardening and tempering of high-temperature seamless tube steels1)
| Steel grade |
Hot forming ℃ |
Normalising ℃ |
Hardening and tempering | ||
|
Hardening temperature 2) ℃ |
Tempering temperature ℃ |
||||
| Code number | Material number | ||||
| ST 35.8 | 1.0305 | between 1100 and 850 3) | 900 to 930 | - | - |
| ST 45.8 | 1.0405 | 870 to 900 | - | - | |
| 17 MN4 | 1.0481 | 880 to 910 | - | - | |
| 19 MN5 | 1.0482 | 880 to 910 | - | - | |
|
15 MO3 |
1.5415 | 910 to 940 | - | - | |
| 13 CRMO 4 4 | 1.7335 | - | 910 to 940 | 660 to 730 | |
| 10 CRMO 9 104) | 1.7380 4) | - | 900 to 960 | 700 to 750 | |
| 14 MOV 6 3 | 1.7715 | - | 950 to 980 | 690 to 730 | |
| X 20 CRMOV 12 1 | 1.4922 | - | 1020 to 1070 | 730 to 780 | |
|
1) The work pieces must attain the specified temperature over the entir cross-section.Provided this has definitely been done further holding further holding at these temperatures is unnecessary when normailising and hardening.The temperatures laid down for tempering shall be held for approximately 30 minutes minimum for the steels 13 CRMO 4 4 and 10 CRMO 9 10 and for 1 hour minimum for the steels 14 MOV 6 3 and X 20 CRMOV 12 1 ,with the annealing time beling counted from the moment when the lower limit of the given temperature range is reached. 2) Cooling in air or controlled atmosphere. Accelerated cooling e.g. in luquid,can become necessary at greater wall thickness. 3) The temperature can drop to 750 ℃ during processing. 4) In addition to given quenching and tempering treatment the folling sequence of treatment can be considered for the steel:900 ℃ to 960 ℃/furnace to 700℃ ≧1 hour 700 ℃ /air. |
|||||
Appendix A
The following table gives tentative figures for the long time high temperature strength of the steels used for seamless tubes.The figures listed are meanvalues for the scatter range representing results so far available. These mean values will be examined from time to time and amended where necessary as further results become available.From the data so far available from long time creep tests it can be assumed that the bottomlimit of this scatter range at the stated temperatures for the steel grades listed is about 20% lower than the stated temperatures for the steel grades listed is about 20% lower than mean value quoted.
| steel grade code number |
temperature ℃ |
1%-time yield limit 1),2) for |
creep strength 2),3) for |
|||
|
10000h N/mm 2 |
10000h N/mm 2 |
10000h N/mm 2 |
10000h N/mm 2 |
200000h N/mm 2 |
||
|
ST 35.8 ST 45.8 |
380 390 |
164 150 |
118 106 |
229 211 |
165 148 |
145 129 |
|
400 410 420 430 440 |
136 124 113 101 91 |
95 84 73 65 57 |
191 174 158 142 127 |
132 118 103 91 79 |
115 101 89 78 67 |
|
|
450 460 470 480 |
90 72 62 53 |
49 42 35 30 |
113 100 86 75 |
69 59 50 42 |
57 48 40 33 |
|
|
17 MN 4 19 MN 5 |
380 390 |
195 182 |
153 137 |
291 266 |
227 203 |
206 181 |
|
400 410 420 430 440 |
167 150 135 120 107 |
118 105 92 80 69 |
243 221 200 180 161 |
179 157 136 117 100 |
157 135 115 97 82 |
|
|
450 460 470 480 490 |
93 83 71 63 55 |
59 51 44 38 33 |
143 126 110 96 84 |
85 73 63 55 47 |
70 60 52 44 37 |
|
| 500 | 49 | 29 | 74 | 41 | 30 | |
| 15 MO 3 |
450 460 470 480 490 |
216 199 182 166 149 |
167 146 126 107 89 |
298 273 247 222 196 |
245 209 174 143 117 |
228 189 153 121 96 |
|
500 510 520 530 540 550 |
132 115 99 84 [70] [59] |
73 59 46 36 [28] [24] |
171 147 125 102 [82] [64] |
93 74 59 47 [38] [31] |
75 57 45 36 [28] [25] |
|
| 13 CRMO 4 4 |
450 460 470 480 490 |
245 228 210 193 173 |
191 172 152 133 116 |
370 348 328 304 273 |
285 251 220 190 163 |
260 226 195 167 139 |
|
500 510 520 530 540 550 560 570 |
157 139 122 106 90 76 64 53 |
98 83 70 57 46 36 30 24 |
239 209 179 154 129 109 91 76 |
137 116 94 78 61 49 40 33 |
115 96 76 62 50 39 32 26 |
|
| 10 CRMO 9 10 |
450 460 470 480 490 |
240 219 200 180 163 |
166 155 145 130 116 |
306 286 264 241 219 |
221 205 188 170 152 |
201 186 169 152 136 |
|
500 510 520 530 540 |
147 132 119 107 94 |
103 90 78 68 58 |
196 176 156 138 122 |
135 118 103 90 78 |
120 105 91 79 68 |
|
|
550 560 570 580 590 |
83 73 65 57 50 |
49 41 35 30 26 |
108 96 85 75 68 |
68 58 51 44 38 |
58 50 43 37 32 |
|
| 600 | 44 | 22 | 61 | 34 | 28 | |
| 14 MOV 6 3 |
480 490 |
243 219 |
177 155 |
299 268 |
219 191 |
182 163 |
|
500 510 520 530 540 |
195 178 161 146 133 |
138 122 107 94 81 |
241 219 198 179 164 |
170 150 131 116 100 |
145 127 109 91 76 |
|
|
550 560 570 580 |
120 109 [98] [88] |
69 59 [48] [37] |
148 134 [121] [108] |
85 72 [59] [46] |
61 48 [37] [28] |
|
| X 20 CRMOV 12 1 |
470 480 490 |
324 299 269 |
260 236 213 |
368 345 319 |
309 284 260 |
285 262 237 |
|
500 510 520 530 540 |
247 227 207 187 170 |
190 169 147 130 114 |
294 274 253 232 213 |
235 211 186 167 147 |
215 191 167 147 128 |
|
|
550 560 570 580 590 |
151 135 118 103 90 |
98 85 72 61 52 |
192 173 154 136 119 |
128 112 96 82 70 |
111 96 81 68 58 |
|
|
600 610 620 630 640 |
75 64 53 44 36 |
43 36 30 25 20 |
101 97 73 60 49 |
59 50 42 34 28 |
48 40 33 27 22 |
|
| 650 |
29 |
17 | 40 | 23 | 18 | |
Hot Tags: seamless tubes of heat-resistant steels, China seamless tubes of heat-resistant steels manufacturers, suppliers, alloy pipe for compressors, alloy pipe for high temperature media transportation, 15CrMo Alloy Pipe, alloy pipe manufacturer, alloy pipe for nuclear power plants, Seamless Alloy steel Tubes
