20# seamless steel pipe 133* 6.5 Which steel pipe size standard is implemented?

Your writing method should implement the expression method of II series pipe outer diameter and pipe wall thickness in HG20553... The most annoying small outer diameter hehe!

There is this in SH3405, DN125, the large diameter is 140, the small diameter is 133.6.5 is SCH40s. It’s strange, the excel file cannot be added to the attachment.

Hey, I only have to write 40 characters less, and I can’t fill it in. How can I feel so embarrassed?

HG20553 (Ia) series SCH40S is 6.3. You need to look at the content of the II series, which has the representation of φ133X6.5.

Let me show you some screenshots, which should explain the problem ~ HG20553 has two series, A series is a large outer diameter series, B outer diameter is a small outer diameter series, and SH3405 is basically a large outer diameter series. Nowadays, it seems that the universal ones are all with large outer diameters. If you use small outer diameters, the valves and flanges must be adjusted accordingly, and it is easy to make mistakes.

This should be able to express clearly, SH3405, SCH40, DN125 small outer diameter

Brother, there is no A and B in HG20553, it should be Ia and Ib, Ib is the rounded version of Ia. In addition to Ia Ib, there is also II series. II series is the real small outer diameter series! Go and read the standards carefully before talking! SH3405 is not "basically" a large outer diameter, it is a pure large outer diameter, just rounded based on the American standard specifications! ! P.S.: The pipe number of small outer diameter pipes is often used in conjunction with Ia, that is, the outer diameter is small, and the pipe thickness is Ia. If you have seen the previous practice of Luoyang Institute, you will understand!

I found a "Dimensions, shapes and weights of seamless steel pipes for structural use (GB/T 8162-1999)" elsewhere. Does this standard have anything to do with HG20553? 1. The outer diameter and wall thickness of steel pipes are divided into two types: hot rolling (extrusion, expansion) and cold drawing (rolling). Its outer diameter and wall thickness should comply with the provisions of GB/T 17395 (Seamless steel pipe dimensions, shape, weight and allowable deviations). Among them, steel pipe sizes include ordinary steel pipe size groups and precision steel pipe size groups. The outer diameter of steel pipes is divided into 3 series, Series 1: Standardized steel pipe ； Series 2: Non-standardized steel pipes ； Series 3: Special purpose steel pipes. The outer diameter of ordinary steel pipes is divided into series 1, 2, and 3 ； The outer diameter of precision steel pipes is divided into series 2 and 3. 1) Ordinary steel pipe size ① outer diameter specification (mm): Series 1: 10 (10.2), 13.5, 17 (17 ； 2), 21 (21.3), 27 (26.9), 34 (33.7), 42 (42.4), 48 (48.3), 60 (60.3), 76 (76.1), 89 (88.9), 114 (114.3 ), 140 (139.7), 168 (168.3), 219 (219.1), 273, 325 (323.9), 356 (355.6), 406 (406.4), 457, 508, 610. Series 2: 6, 7, 8, 9, 11, 12, 13 (12.7), 16, 19, 20, 25, 28, 32 (31.8), 38, 40, 51, 57, 63 (63.5), 65, 68, 70, 77, 80, 85 , 95, 102 (101.6), 121, 127, 133, 146, 203, 299, 340 (339.7), 351, 377, 402, 426, 450, 480, 500, 530, 630. Series 3: 14, 18, 22, 25.4, 30, 35, 45 (44.5), 54, 73, 83 (82.5), 108, 142 (141.3), 152 (152.4), 159, 180 (177.8), 194 (193. 7), 245 (244.5), 560 (559), 660. ②Wall thickness specifications (mm): 0.25, 0.30, 0.40, 0.50, 0.60, 0.80, 1.0, 1.2, 1.4, 1.5, 1.6, 1.8, 2.0, 2.2 (2.3), 2.5 (2.6), 2.8, 3.0 (2.9), 3.2, 3.5 (3.6), 4.0, 4.5, 5.0, 5.5 (5.4), 6.0, 6.5 (6.3), 7.0 ( 7.1), 7.5, 8.0, 8.5, 9.0 (8.8), 9.5, 10, 11, 12 (12.5), 13, 14 (14.2), 15, 16, 17 (17.5 ), 18, 19, 20, 22 (22.2), 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 42, 45, 48, 50, 55, 60, 65. Note: Dimensions in parentheses indicate corresponding inch specifications and are not recommended. 2) Precision steel pipe size ① outer diameter specification (mm): Series 2: 4, 5, 6, 8, J0, 12, 12.7, 16, 20, 25, 32, 38, 40, 42, 48, 50, 60, 63, 70, 76, 80, 100, 120, 130, 150, 160, 170, 190, 200. Series 3: 14, 18, 22, 28, 30, 35, 45, 55, 90, 110, 140, 180, 220, 240, 260. ②Wall thickness specifications (mm): 0.5, (0.8), 1.0, (1.2), 1.5, (1.8), 2.0, (2.2), 2.5, (2.8), 3.0, (3.5), 4, (4.5), 5, (5.5), 6, (7), 8, (9), 10, (11), 12.5, (14), 16, (18), 20, (22), 25. Note: Dimensions in brackets are not recommended.

First of all, GB/T 8162-1999 has been updated to the 2008 version. Its specifications are based on GB17395. Of course, you can also want it to be related to HG20553. The specification also says that other pipe outer diameters and thicknesses can be used after discussion between the supply and demand parties! GB/T 8162 is only a manufacturing inspection standard, and its specifications can be implemented with reference to GB17395 or HG20553! It’s not a parallel relationship with the latter two! However, GB/T 8162 is a seamless pipe for structural use. We who are engaged in process pipeline design have never chosen this standard for pipelines transporting media, so we do not recommend that you adopt GB/T 8162. There are not many other comments!

Um, okay, what I mean by the large outer diameter and small outer diameter of HG20553 is I and II. But it is true that I am a little vague about these standards, because I rarely use them, usually SH3405, so I still need to read more standards, gain more experience, and learn more from my elder brother. * .