Connection method of stainless steel seamless pipe

Stainless steel seamless pipes can be connected in a variety of ways. The common types of fittings are compression type, compression type, union type, push type, push thread type, socket welding type, union flange connection, welding type and welding and traditional Derived series joins that combine joins. These connection methods have different application scopes according to their different principles, but most of them are easy to install, firm and reliable. Most of the sealing rings or gasket materials used in the connection are made of silicone rubber, nitrile rubber and EPDM rubber that meet the requirements of national standards, which relieves users from worries.

Press connection steps of stainless steel seamless pipe

1. Broken pipe: Cut the pipe according to the required length. When breaking the pipe, do not use too much force to prevent the pipe from being out of round.
2. Deburring: After the pipe is cut, the burrs should be removed to avoid cutting the sealing ring.
3. Scribing mark: In order to make the steel pipe fully inserted into the fitting socket, the insertion length must be marked and drawn at the end of the pipe.
4. Assembly: The sealing ring should be correctly installed in the U-shaped groove of the pipe fitting, insert the pipe into the socket of the pipe fitting, and wait for crimping.
5. Crimping: When crimping, the protruding parts of the pipe fittings are placed in the concave groove of the mold, and the jaws are kept perpendicular to the axis of the pipe.
6. Inspection: After the crimping is completed, use a special gauge to check the crimping size.

Representation method of stainless steel seamless pipe

① Use international chemical element symbols and national symbols to indicate chemical components, and use Arabic letters to indicate component content:
Such as: China, Russia 12CrNi3A
② Use fixed-digit numbers to represent steel series or numbers; such as: the United States, Japan, 300 series, 400 series, 200 series;
③The serial number is composed of Latin letters and sequence, which only indicates the purpose.

Numbering rules for stainless steel seamless pipes

① Use element symbols;
②Chinese pinyin, open hearth steel: P; boiling steel: F; killed steel: B; class A steel: A; T8: special 8; GCr15: ball.
Combination steel, spring steel, such as: 20CrMnTi 60SiMn, (express the C content in ten thousandths).
Stainless steel, alloy tool steel (C content expressed in thousandths), such as: 1Cr18Ni9 one thousandth (ie 0.1%C), stainless C≤0.08% such as 0Cr18Ni9, ultra-low carbon C≤0.03% such as 0Cr17Ni13Mo.

Marking method of stainless steel seamless pipe

The American Iron and Steel Institute uses three digits to mark various standard grades of malleable stainless steel. in:
①Austenitic stainless steel is marked with 200 and 300 series numbers, for example, some of the more common austenitic stainless steels are marked with 201, 304, 316 and 310.
②Ferritic and martensitic stainless steels are represented by numbers in the 400 series. Ferritic stainless steel is marked by 430 and 446, martensitic stainless steel is marked by 410, 420 and 440C, duplex (austenite-ferrite).
③Stainless steel, precipitation hardening stainless steel and high alloys with iron content less than 50% are usually named by patent names or trademarks.

Standard Classification of Stainless Steel Seamless Tubes

4-1 Grading classification:
① National standard GB ② Industry standard YB ③ Local standard ④ Enterprise standard Q/CB
4-2 Classification:
①Product Standard ②Packaging Standard ③Method Standard ④Basic Standard
4-3 standard level (divided into three levels):
Level Y: International Advanced Level I Level: General International Level H Level: Domestic Advanced Level
4-4 GB:
GB1220-84 stainless steel bar (grade I) GB4241-84 stainless steel welding plate (grade H)
GB4356-84 stainless steel welded disc garden (level I) GB1270-80 stainless steel pipe (level I)
GB12771-91 stainless welded pipe (Y grade) GB3280-84 stainless cold plate (I grade)

GB4237-84 stainless hot plate (level I) GB4239-91 stainless cold strip (level I)