1. What are the executive standards for stainless steel pipes in China?
No. Standard type Production standard
1 European standard EN10216-5; EN10216-2
2 German standard DIN 17456; DIN 17458
3 American Standard ASTM A312; A213; A269; A511; A789; A790;
ASME SA213; SA312; SA789; SA790;
ASTM B423, ASTM B407, ASTM B668, ASTM B163;
ASME SB163, ASME SB423, ASME SB407, ASME SB668;
4-day standard JIS G3459; G3463
5 Russian standard GOST 9941; GOST 5632
6 National standard GB/T14975, GB/T14976; GB13296; GB5310; GB9948
The company’s product specifications: outer diameter: 6-762mm, wall thickness: 0.5-50mm, maximum length: 18000mm, special specifications can be produced and supplied after negotiation.
Stainless steel pipe seamless pipe material: 304 (0Cr18Ni9), 304L (00Cr19Ni10), 316 (0Cr17Ni12Mo2), 316L (00Cr17Ni14Mo2), 316Ti (0Cr17Ni12Mo2Ti), 1Cr18Ni9Ti/321H (0Cr18Ni10Ti), 310S (0Cr19Ni11Nb), 3437H (0Cr19Ni11Nb), 3437H (0Cr17Ni12Mo2Ti) (00Cr19Ni13Mo3), S31803 (00Cr22Ni5Mo3N).
Product technical standards: GB/T14975-2002, GB/T14976-2002, GB13296-2007, GB 9948-2006, GB5310-2008, ASTM A312, ASTM A213, ASTMA269, ASTM A789, ASTM A790, ASTM A511, JIS 3463, JIS 3459, DIN 2462, DIN 17456, DIN 17458.
2. The specific content of the national standard for stainless steel pipes
My friend, the standard number you provided is invalid! The following one is the standard to replace it, you have a look!
Standard number: GB/T 14976-2002
Standard name: stainless steel seamless steel pipe for fluid transportation
Standard Status: Current
English title: Stainless steel seamless tubes for fluid transport
Alternative situation: GB/T 14976-1994
Implementation date: 2003-2-1
Issuing authority: General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China
Introduction: This standard specifies the size, shape, technical requirements, test methods, inspection rules, packaging, standards and quality certificates of stainless steel seamless steel pipes for fluid transportation. This standard applies to stainless steel seamless steel pipes for fluid transportation.
3, stainless steel pipe specification table
Conversion table of DN diameter and mm of seamless steel pipe:
DN stands for “nominal diameter” and is measured in mm.
The unit of inch is not allowed after the DN!
The value after the DN is rounded, the DN80 pipe does not mean that its diameter is 80mm (usually the inner diameter of the DN80 pipe is 76mm). Therefore, there is no formula for converting “nominal diameter” and “actual diameter”, and the table must be looked up.
“Φ” and “DN” are generally used to indicate diameter, the difference is:
“Φ” indicates the diameter of an ordinary circle, or the outer diameter of the pipe multiplied by the wall thickness, such as: Φ25*3 indicates the pipe with an outer diameter of 25mm and a wall thickness of 3mm; “DN”: indicates the nominal diameter of pipe and valve and other pipe fittings, Usually close to the inner diameter. It is a standard term established for engineering installation matching.
Φ is the outer diameter, and DN is the inner diameter DN: nominal diameter Ф: outer diameter
Today’s pipes are generally measured in inches, and millimeters are just a relatively approximate and easy to remember number.
For example, the DN50 pipe should be 2 inches, 1 inch = 25.4mm, and 2 inches should be 50mm. At this time, it depends on the wall thickness of the pipe. Generally, the spiral pipe is more than 5mm. Take 5mm as an example, the outer diameter of the DN50 pipe Should be around 60mm.
4, Steel pipe size standard
The pipe diameter should be in mm, and the expression of the pipe diameter should meet the following requirements: 1. For pipes such as water gas transmission steel pipes (galvanized or non-galvanized), cast iron pipes, etc., the pipe diameter should be expressed in the nominal diameter DN;
2 For seamless steel pipe, welded steel pipe (straight seam or spiral seam), copper pipe, stainless steel pipe and other pipes, the pipe diameter should be represented by D*δ (outer diameter * wall thickness);
3 For pipes such as reinforced concrete (or concrete) pipes, clay pipes, acid-resistant ceramic pipes, and cylinder tile pipes, the pipe diameter should be indicated by the inner diameter d;
4 For plastic pipes, the pipe diameter should be expressed according to the product standard method: when the nominal diameter DN is used to express the pipe diameter in the design, there should be a comparison table between the nominal diameter DN and the corresponding product specifications. The specifications of rigid PVC pipes for building drainage are expressed by de (nominal outer diameter)*e (nominal wall thickness) (GB 5836.1-92)
The specifications of polypropylene (PP) pipes for water supply are represented by de*e (nominal outer diameter * wall thickness)
Metric and Imperial Unit Conversions
1 inch = 25.4 mm = 8 inches 1/2 is a quarter (4 inches) DN15 3/4 is a sixth (6 inches) DN20 2 inches DN8 4 inches DN15 6 inches DN20 1′ DN25 1.2′ DN32 1.5′ DN40 2′ DN50 2.5′ DN65 3′ DN80 4′ DN100 5′ DN125 6′ DN150 8′ DN200 10′ DN250 12′ DN300
Calculation formula of theoretical weight per meter of steel pipe:
W=3.1416*ρδ(D-δ)/1000 W——the theoretical weight of steel pipe per meter kg/m;
ρ——steel density kg/dm-3; 7.81, 7.85, 7.91 D——nominal outer diameter of steel pipe in mm; δ——nominal wall thickness of steel pipe in mm;
extend:
National standard steel pipe
The national standard steel pipe is made of steel ingot or solid tube blank through perforation to make capillary, and then hot rolled, cold rolled or cold drawn. National standard steel pipe plays an important role in my country’s steel pipe industry. According to incomplete statistics, there are more than 240 national standard steel pipe manufacturers in my country, more than 250 sets of seamless steel pipe units, and an annual production capacity of about 4.5 million tons. In terms of diameter,
5. Answers to the implementation standards of several common material grades of stainless steel pipes
1. Stainless steel pipe material:
201(1Cr17Mn6Ni5N)
202(1Cr18Mn8Ni5N)
301(1Cr17Ni7)
302(1Cr18Ni)
304(0Cr18Ni9), SS304, TP304
304L(00Cr19Ni10), SS304L, TP304L
321(1Cr18Ni9Ti), SS321, TP321
316(0Cr17Ni12Mo2), SS316, TP316
316L(0Cr17Ni14Mo2), SS316L, TP316L
310S(0Cr25N20), SS310S, TP310S
Second, stainless steel pipe implementation standards:
GB2270-80 Stainless Steel Seamless Steel Pipe
GB/T14976-94 Stainless steel seamless steel pipe for fluid transportation
GB/T12771-2000 Stainless steel welded steel pipe for fluid transportation
GB/T14975-94 Stainless steel seamless steel pipe for structure
GB13296-91 Stainless steel seamless steel pipes for boilers and heat exchangers
(GJB2608-96) (YB676-73) Thick-walled seamless steel pipe of structural steel for aviation
(GJB2296-95) (YB678-71) Aviation stainless steel seamless steel pipe
(YB/T679-97) (YB679-71) 18A hollow rivet thin-walled seamless steel pipe for aviation
(GJB2609-96)(YB680-71) Structural thin-walled seamless steel pipe for aviation
(YB/T681-97) (YB681-71) 20A thin-walled seamless steel pipe for aviation conduit
GB3090-82 stainless steel small diameter steel pipe
GB5310-95 Seamless steel tube for high pressure boiler
GB3087-82 Low and medium pressure seamless steel pipe
GB3089-92 Stainless acid-resistant extremely thin-walled seamless steel pipe
GB9948-88 Petroleum cracking seamless steel pipe
ASTM A213 Seamless Ferritic and Austenitic Alloy Steel Pipes for Boilers and Heat Exchangers
ASTM A269 General Purpose Austenitic Stainless Steel Seamless and Welded Steel Pipe
ASTM A312 Austenitic Stainless Steel Seamless Steel Pipe Welded Steel Pipe Welded Steel Pipe
ASTM A450 General Requirements for Carbon Steel, Ferritic and Austenitic Alloy Steel Pipe
ASTM A530 General Requirements for Ferritic and Alloy Steels for Special Purposes
ASTM A789 General Requirements for Carbonitic Austenitic Stainless Steel Seamless and Welded Steel Pipes
JIS G3456-88 Stainless steel pipes for mechanical structures
JIS G3448-88 Stainless steel pipes for ordinary pipes
JIS G3459-88 Stainless steel pipes for pipes
JIS G3463-88 Stainless steel tubes for boilers and heat exchangers
Q/HYAD 101-91 Seamless long steel pipe for chemical industry
(0Cr18NI11T) Q/HYAD 103-91 00Cr18Ni5MO3Si2 Duplex Stainless Steel Seamless Steel Tube
6, Is there a standard for stainless steel pipe specifications?
Mechanical structure and decorative pipes
ASTM A554
GB/T 12770
JIS G3446
industrial pipeline
ASTM A778 A312 A358
GB/T 12771
JIS G 3468 G3459
drinking water
GB/T 19228
JIS G3448
Boilers and Heat Exchangers
ASTM A249 A269
JIS G3447
GB/T 24593
food hygiene tube
DIN 11850
ASTM A270
7, thin wall stainless steel pipe standard
We may not know much about thin-walled stainless steel water pipes, but what I want to say is that since the rapid development of the steel pipe industry, thin-walled stainless steel water pipes have emerged as the times require. At the same time, various steel pipe manufacturers have also sprung up to produce different steel pipes. Now all kinds of steel pipes are widely promoted in China. Of course, we may not know much about the industry standards of thin-walled stainless steel water pipes. Now let us understand the standards of the thin-walled stainless steel water pipe industry.
Thin-walled stainless steel water pipe industry standard
The standard appearance size of the thin-walled stainless steel water pipe is 1.5. The surface of the appearance of the welded seam of the water pipe should be free of cracks, pores, undercuts and slag inclusions. The inside and outside should be well processed, and there should be no scratches, pits and corrections that exceed the negative tolerance of the water pipe wall thickness. Straight marks and other defects. The fracture should be free of burrs. The rest should meet the requirements of Clause 5.7 in the B/T12771-2000 standard. Industry standard basic size of thin-walled stainless steel water pipe Industry standard size deviation of thin-walled stainless steel water pipe, the allowable deviation of the wall thickness of the water pipe is ±10% of the nominal wall thickness.
The length of the water pipe is a fixed length, generally 3000~6000mm. According to the requirements of the buyer and the agreement between the supplier and the buyer, other fixed lengths can also be provided, and the allowable deviation is 1mm. The bending degree of the water pipe shall be any 3000mm and no more than 12mm. The end of the water pipe shall be sawed flat, and the inclination of the end of the water pipe shall comply with the provisions of Table 4. Thin-walled stainless steel water pipe industry standard end quality thin-walled stainless steel water pipe industry standard manufacturing method, raw materials and manufacturing method. The raw material of the water pipe is stainless steel cold (hot) rolled strip, and its requirements should meet the requirements of GB/T4239 and YB/T5090. Stainless steel strips for water pipes are made by automatic argon arc welding or plasma welding on pipe-making equipment, and generally do not undergo heat treatment after welding. The industry standard inspection specification for thin-walled stainless steel water pipes. When the flattening performance water pipe is subjected to the flattening test, the distance between the water pipe and the pressure plate is 1/3 of the outer diameter of the water pipe, and cracks and damages shall not appear after flattening. Flaring performance When the water pipe with a nominal diameter of not more than DN50mm is used for the flaring test, a 60° cone is used, and the flaring rate is 25%. After flaring, the pipe wall shall not be cracked or damaged.
Bending performance of water pipes with a nominal diameter of not more than DN25mm when subjected to the industry standard testing specification test for thin-walled stainless steel water pipes, the bending radius is equal to 4 times the outer diameter of the water pipe. When the bending angle is 90°, cracks and wrinkles should not appear on the pipe wall. Hydraulic test, air tightness test. When the water pipe is subjected to the hydraulic test, its test pressure is 2.45MPa, and the water pipe shall be free of leakage and permanent deformation after lasting 10s under this pressure. When the water pipe is tested for hydraulic gas medium or form, the air tightness test should be carried out. The pressure for liquid medium is 0.6MPa, and the test pressure for gas medium is 1.7MPa, the industry standard inspection specification for thin-walled stainless steel water pipes. , the water pipe should be free of air bubbles. When the water pipe is subjected to eddy current inspection, the diameter of the artificial standard defect hole should meet the level in GB/T7735. Sanitary requirements: The sanitary requirements after soaking of water pipes used for drinking water and domestic drinking water and domestic drinking water meet the requirements of B/T17-219 when required by users or during type inspection.