文档介绍：薄壁不锈钢管规范[1]
People's Republic of China urban construetion industry
standards
Thin wall stainless steel pipe
CJ/T 151als
The materials for pipes are shown in table 1.
Table 1 material grade of water pipe
Brand
Use
0Crl8Ni9 (304)
Drinking water, drinking water, air, medical gas, hot water and other pipes
0Crl7Nil2Mo2 (316)
An occasion where corrosion resistance is higher than 0Crl8Ni9 00Crl7Nil4Mo2 (316L)
seawater
chemical composition: the chemical composition of the pipe shall comply with the provisions of table 2. Table 2 chemical composition of pipe
Grade
C
Si
Mn
P
S
Ni
Cr
Mo
0Crl8Ni9
Less than or equal to
Less than or equal to 1
Less than or equal to 2
Less than or equal to 0. 035
Less than or equal to 0. 03
& 0-11. 0
17. 0-19. 0
0Crl7Nil2Mo2
Less than or equal to 0. 08
10. 0-14. 0
16. 0T& 0
0-3. 0
00Crl7Nil4Mo2
Less than or equal to 0. 03
12. 0-15. 0
1. 3 mechanical properties: the tensile strength and elongation of the pipe shall comply with the provisions of table 3.
Table 3 tensile strength and elongation of pipe
Grade
Pull it out, MPa
Elongation, %
0Crl8Ni9
More than 520
More than 35
0Crl7Nil2Mo2
00Crl7Nil4Mo2
More than 480
3. 2 appearance
The surface of water pipe weld shall be free of cracks, pores, edges and slag, and the inner and outer surfaces should be well machined,
Should not exceed the water pipe
Defects such as seratch, dent and straightening mark of wall thickness and negative tolerance. There should be no burr in the fracture. The rest shall conform to GB/T12771-2000 5. 7 requirements.
3. 3 dimensional and dimensional tolerances
The basic dimensions of the 3. 3. 1 pipe shall conform to the provisions of table 4.
Table 4 basic dimensions of water pipes
Nominal path
DN
Outside diameter of pipe
Dw
Outside diameter permit
deviation
wall thickness
S
Weight
0Crl8Ni9
0Crl7Nil2Mo2
00Crl7Nil4Mo2
Ten
Ten
+ 0. 10
Zero point six
Zero point eight
W=0. 02491 (Dw-S) * S