Metal pipes
Various steel pipes
(1) Seamless steel pipe
Standard:
Article 1: Pipes (seamless steel pipes) with outer diameter φ<219mm or less are available for selection;
Article 2: Seamless steel pipe (GB8163-87), hot rolled and cold drawn ordinary carbon steel, high quality carbon steel, low alloy steel and common alloy structural seamless steel pipe, used to transport the following fluids: a steam, b compressed air, c vacuum, d brine, e weak base, f circulating water, process water, g materials without acid and alkali corrosion (production materials)
Article 3: The steel grades of seamless steel pipes are 10, 20, 09MnV, 16Mn, etc.;
Article 4: The wall thickness is selected as follows: PN ≤ 2.5MPa (common steel number 20#)
| c材料 |
DN |
| 10 |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
250 |
| 20# |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4 |
4 |
4 |
4.5 |
5 |
6 |
| 10# |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
4 |
5 |
4.5 |
5.5 |
7 |
| 16Mn |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
3.2 |
3.5 |
4 |
4.5 |
5 |
(2) Steel pipe for petroleum cracking (GB9948-88)
Standard:
Article 1: Seamless steel pipes such furnace tubes, heat exchanger tubes and pipelines used in petroleum refineries, the specifications are as follows "▲".
| 外径 mm |
直 壁厚 mm |
| 2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
12 |
14 |
16 |
| 18 |
▲ |
|
|
|
|
|
|
|
|
|
|
| 19 |
▲ |
▲ |
|
|
|
|
|
|
|
|
|
| 25 |
|
▲ |
|
|
|
|
|
|
|
|
|
| 38 |
|
|
▲ |
|
|
|
|
|
|
|
|
| 60 |
|
|
|
▲ |
▲ |
▲ |
▲ |
▲ |
|
|
|
| 89 |
|
|
|
|
|
▲ |
▲ |
▲ |
▲ |
|
|
| 102 |
|
|
|
|
|
▲ |
▲ |
▲ |
▲ |
|
|
| 114 |
|
|
|
|
|
▲ |
▲ |
▲ |
▲ |
▲ |
|
| 127 |
|
|
|
|
|
▲ |
▲ |
▲ |
▲ |
▲ |
|
| 152 |
|
|
|
|
|
▲ |
▲ |
▲ |
▲ |
▲ |
▲ |
Article 2: Steel pipe steel number: 10, 20, 12CrMo, 15CrMo, 1CrMo, 1Cr2Mo, 1Cr18Ni9, 1Cr19Ni11Nb;
Article 3: No. 10 and No. 20 tubes have good weldability and can be used as furnace tubes, and the use temperature is between -40 and 475 °C;
Article 4: 15A13MoWTi is used as high temperature heavy oil furnace tube and anti-H2S tower equipment and parts such as trays, sieve plates, etc., and the Cr5Mo furnace tubes are used at temperatures below 650 °C;
Claim:
Article 1: Materials are selected according to the minimum wall thickness.
Article 2: Different steel grades are selected according to the characteristics of the medium, and 20# steel pipe is preferred.
(3) Seamless steel tubes (GB3087-82) for medium and low pressure boilers
Standard:
Article 1: This type of steel pipe is suitable for superheated steam pipes and boiling water pipes for various structural low and medium pressure boilers made of low carbon steel;
Article 2: Commonly used materials are 10 and 20 steels. The temperature of 10 and 20 steels is between -20 and 475 °C, which is widely used in wall temperature junction box and steam conduit, superheater tube with wall temperature of 500 °C, water wall tube and economizer tube in the boiler industry;
Article 3: the working temperature of 5MnV, 12MnMoV is -20 ~ 475 ° C, and these two are suitable for 20 steel boiler tube;
Article 4: the working temperature of 12MoVWBSiRe (chromium-free No. 8) is 400-580 ° C, used as a boiler superheater tube with wall temperature ≤ 580 ° C;
Article 5: 12Cr2MoWVB (102 steel) has good process performance, long-lasting plasticity of oxidation resistance, good timeliness, working temperature of 600 ~ 620 ° C, used for boiler superheater, reheater or main steam pipe with wall temperature of 600 ~ 620 °C;
Article 6: 15CrMo has good welding performance, and the use temperature is 350 ~ 560 ° C ( the low temperature can be -40 ° C), which is widely used in the boiler industry as a water wall tube for wall temperature of high pressure boilers and a header and steam conduit of ≤550 °C.
Requirements: The type of steel pipe meets the requirements of Table 15-41 of the Second Handbook of Chemical Process Design Manual, and the weight is shown in GB8163-87. The length of the steel pipe and the water pressure test are the same as those of GB8163-87.
(4) High-pressure seamless steel pipe for fertilizers (GB6479-86)
Standard:
Article 1: This kind of steel pipe is suitable for the nominal pressure 10～32MPa, working temperature-40～400°C, and the conveying medium is synthetic ammonia feed gas (hydrogen, nitrogen) to synthesize ammonia, methanol, urea;
Article 2: The dimensional tolerance of the pipe shall be in accordance with GB8163-87. The weight of steel pipe can be found in Table 15-42 of the Chemical Engineering Design Manual.
Article 3: The applicable temperature range for each steel grade is as follows:
20, 15MnV, 12MnMoV, 10MoVNbTi ≤ 300 °C.
(5) Stainless steel seamless steel pipe (GB2270-80)
Standard:
Article 1: Suitable for pipelines with strong corrosive media in the chemical and petroleum industries;
Article 2: The specifications of the steel pipe are as follows:
| 材料 |
PN Mpa |
DN |
| 10 |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
150 |
200 |
| 321 |
<=1.0 |
2 |
2 |
2 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3.5 |
3.5 |
| 321 |
1.6 |
2 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3 |
3 |
3.5 |
3.5 |
| 321 |
2.5 |
2 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3 |
3.5 |
3.5 |
4 |
4.5 |
Article 3: a seamless stainless steel tube can be selected only when the outer diameter is <φ219;
Article 4: Common materials for seamless stainless steel pipes are:
0Cr13, 1Cr13, 1Cr17Ni2, 1Cr25Ti, 0Cr18Ni9Ti, 00Cr18Ni10Ti, 1Cr18Ni9, 1Cr18Ni9Ti, 00Cr17Ni14Mo2, 00Cr17Ni14Mo3, 0Cr18Ni12Mo2Ti, and the like.
Requirements: 304 (1Cr18Ni9, 0Cr18Ni9) is used for general corrosive media, 321 (0Cr18Ni9Ti, 1Cr18Ni9Ti. 304 has low intergranular corrosion resistance, 321 is heat resistant below 600 °C and has high resistance to intergranular corrosion. For highly corrosive strongly acidic solution materials, 0Cr17Ni12Mo2/(316), 00Cr17Ni14Mo2/(316L) molybdenum dititanium (0Cr18Ni12Mo2Ti), etc. are used. Molybdenum dititanium and molybdenum trititanium are heat resistant below 600 °C，without intergranular corrosion, and resistant to sulfite, boiling phosphoric acid, formic acid, acetic acid and other acids and bleaching powders and sulfite liquids. Stainless acid resistant steel, such as nickel, chromium and molybdenum, should be replaced by acid-resistant cast iron or nickel-free stainless steel and acid-resistant steel.
Materials are selected in order of priority from low to high performance.
