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Short Description:

Seamless Stainless Steel Tube
Payment Term
T/T;L/C;Western Union;Paypal
Delivery Time
7-15 days upon receipt of the deposit
Standard Export Packing or As Customers Requirement

Product Detail


Product Tags


Sesmless Staninless Steel Tube/Pipe
Product: Sesmless Staninless Steel Tube/Pipe
Material: Stainless Steel 200 series,300series,400series
Dimension: Thickness:0.5MM-6MM,OD:10MM-325MM
Length: Random Length
Surface Finish: No.1/2B/No.4/4K/6K/8K/HL/Matt
Tchnology: Cold Rolled ,Hot Rolled
Package: Standard Export Packing,Or As Per Your Requirement
Application: Railings,Staircase Railing Balustrade,Windows,Balustrsde System,Equipment Manufacturing and Maintenance,etc.
Mechanical Property
ASTM TS(Mpa)≥ YS(Mpa)≥ EL(%)≥ Hardness
201 520 275 40 241 100
202 520 275 40 207 95
301 520 205 40 207 95
304 520 205 40 20 90
304L 480 175 40 187 90
309S 520 205 40 187 90
310 520 205 40 187 90
310S 520 205 40 187 90
316 520 205 40 187 90
316L 480 175 40 187 90
316Ti 520 205 40 187 90
317L 480 175 40 187 90
321 520 205 40 187 90
430 450 205 22 183 88
904L 490 216 35
2205 640 25
Chemical Composition
Chemical Composition(%)
C Si Mn P S Ni Cr Mo Cu N Other
1Cr17Mn6Mi5N 201 0.15 1.00 5.5-5.7 0.06 0.03 3.3-3.5 16-18 _ _ 0.05-0.25
1Cr18Mn8Mi5N 202 0.15 1.00 7.5-10 0.06 0.03 4.0-6.0 17-19 _ _ 0.05-0.25
1Cr18Mn8Mi5N 301 0.15 1.00 2.00 0.07 0.03 6.0-8.0 16-18 _ _ 0.10
0Cr18Ni9 304 0.07 1.00 2.00 0.035 0.03 8.1-10.0 17-19 _ _ _
0Cr18Ni9 309S 0.08 1.00 2.00 0.035 0.03 12.0-15.0 22-24 _ _ _
0Cr25Ni20 310S 0.08 1.00 2.00 0.035 0.03 19.0-22.0 24-26 _ _ _
0Cr17Ni12Mo2 316 0.08 1.00 2.00 0.035 0.03 10.0-14.0 16-18.5 2.0-3.0 _ _
00Cr17Ni14Mo2 316L 0.08 1.00 2.00 0.035 0.03 12.0-15.0 16-18 2.0-3.0 _ _
0Cr18Ni12Mo3Ti 316Ti 0.08 1.00 2.00 0.035 0.03 11.0-14.0 16-19 2.5-3.5 _ _ Ti≥5C
0Cr18Ni12Mo3Ti 317L 0.03 1.00 2.00 0.035 0.03 11.0-15.0 18-20 3.0-4.0 _ _
1Cr18Ni9Ti 321 0.12 1.00 2.00 0.035 0.03 8.0-11.0 17-19 _ _ _ Ti5C-0.70
1Cr12 430 0.12 1.00 2.00 0.035 0.03 0.60 16-18 _ _ _
00Cr20Ni25Mo4.5Cu 904L 0.02 1.00 2.00 0.035 0.03 23.0-28.0 19-23 4.0-5.0 1.0-2.0 0.14-0.20
00Cr2Ni5Mo3N 2205 0.03 1.00 2.00 0.035 0.02 4.5-6.5 21-23 2.5-3.5 _ _
Stainless steel national standard _ stainless steel implementation standard _ national stainless steel grade comparison table
No China GB Japan United States Korea EU India Australia Taiwan, China
Old grade New grade(07.10) JIS ASTM UNS KS BS EN IS IS CNS
Austenitic stainless steel
1 lCrl7Mn6Ni5N 12Crl7Mn6Ni5N SUS201 201 S20100 STS201 1.4372 10Crl7Mn6Ni4N20 201-2 201
2 lCrl8Mn8NI5N 12Crl8Mn9Ni5N SUS202 202 S20200 STS202 1.4373 - 202
3 lCrl7Ni7 12Crl7Ni7 SUS301 301 S30100 STS301 1.4319 10Crl7Ni7 301 301
4 0Crl8Ni9 06Crl9Nil0 SUS304 304 S30400 STS304 1.4301 07Crl8Ni9 304 304
5 00Crl9Nil0 022Crl9Nil0 SUS304L 304L S30403 STS304L 1.4306 02Crl8Nill 304L 304L
6 0Crl9Ni9N 06Crl9Nil0N SUS304N1 304N S30451 STS304N1 1.4315 - 304N1 304N1
7 0Crl9Nil0NbN 06Crl9Ni9NbN SUS304N2 XM21 S30452 STS304N2 - - 304N2 304N2
8 00Crl8Nil0N 022Crl9Nil0N SUS304LN 304LN S30453 STS304LN - - 304LN 304LN
9 lCrl8Nil2 10Crl8Nil2 SUS305 305 S30500 STS305 1.4303 - 305 305
10 0Cr23Nil3 06Cr23Nil3 SUS309S 309S S30908 STS309S 1.4833 - 309S 309S
11 0Cr25Ni20 06Cr25Ni20 SUS310S 310S S31008 STS310S 1.4845 - 310S 310S
12 0Crl7Nil2Mo2 06Crl7Nil2Mo2 SUS316 316 S31600 STS316 1.4401 04Crl7Nil2Mo2 316 316
13 0Crl8Nil2Mo3Ti 06Crl7Nil2Mo2Ti SUS316TI 316TI S31635 - 1.4571 04Crl7Nil2MoTi20 316Ti 316TI
14 00Crl7Nil4Mo2 022Crl7Nil2Mo2 SUS316L 316L S31603 STS316L 1.4404 ~02Crl7Nil2Mo2 316L 316L
15 0Crl7Nil2Mo2N 06Crl7Nil2Mo2N SUS316N 316N S31651 STS316N - - 316N 316N
16 00Crl7Nil3Mo2N 022Crl7Nil3Mo2N SUS316LN 316LN S31653 STS316LN 1.4429 - 316LN 316LN
17 0Crl8Nil2Mo2Cu2 06Crl8Nil2Mo2Cu2 SUS316J1 - - STS316J1 - - 316J1 316J1
18 00Crl8Nil4Mo2Cu2 022Crl8Nil4Mo2Cu2 SUS316J1L - - STS316J1L - - - 316J1L
19 0Crl9Nil3Mo3 06Crl9Nil3Mo3 SUS317 317 S31700 STS317 - - 317 317
20 00Crl9Nil3Mo3 022Crl9Nil3Mo3 SUS317L 317L S31703 STS317L 1.4438 - 317L 317L
21 0Crl8Nil0Ti 06Crl8NillTi SUS321 321 S32100 STS321 1.4541 04Crl8Nil0Ti20 321 321
22 0Crl8NillNb 06Crl8NillNb SUS347 347 S34700 STS347 1.455 04Crl8Nil0Nb40 347 347
Austenitic-ferritic stainless steel (duplex stainless steel)
23 0Cr26Ni5Mo2 - SUS329J1 329 S32900 STS329J1 1.4477 - 329J1 329J1
24 00Crl8Ni5Mo3Si2 022Crl9Ni5Mo3Si2N SUS329J3L - S31803 STS329J3L 1.4462 - 329J3L 329J3L
0Crl8Nil0Ti ferritic stainless steel
25 0Crl3AI 06Crl3Al SUS405 405 S40500 STS405 1.4002 04Crl3 405 405
26 - 022CrllTi SUH409 409 S40900 STS409 1.4512 - 409L 409L
27 00Crl2 022Crl2 SUS410L - - STS410L - - 410L 410L
28 lCrl7 10Crl7 SUS430 430 S43000 STS430 1.4016 05Crl7 430 430
29 lCrl7Mo 10Crl7Mo SUS434 434 S43400 STS434 1.4113 - 434 434
30 - 022Crl8NbTi - - S43940 - 1.4509 - 439 439
31 00Crl8Mo2 019Crl9Mo2NbTi SUS444 444 S44400 STS444 1.4521 - 444 444
Martensitic stainless steel
32 lCrl2 12Crl2 SUS403 403 S40300 STS403 - - 403 403
33 lCrl3 12Crl3 SUS410 410 S41000 STS410 1.4006 12Crl3 410 410
34 2Crl3 20Crl3 SUS420J1 420 S42000 STS420J1 1.4021 20Crl3 420 420J1
35 3Crl3 30Crl3 SUS420J2 - - STS420J2 1.4028 30 Crl3 420J2 420J2
36 7Crl7 68Crl7 SUS440A 440A S44002 STS440A - - 440A 440A

Stainless steel seamless tube/pipe


Stainless steel seamless pipe is a long steel with a hollow cross-section and no seams around it. The thicker the wall thickness of the product, the more economical and practical it will be, and the thinner the wall thickness, the greater the processing cost.

The process of this product determines its limited performance. Generally, the precision of seamless steel tubes is low: uneven wall thickness, low brightness of the inside and outside of the tube, and high cost of sizing, and there are also pits and black spots on the inside and outside. Shaping must be handled offline. Therefore, it embodies its superiority in high-pressure, high-strength, mechanical structural materials.


According to the rolling method, there are hot rolled, hot extruded and cold drawn (rolled) stainless steel tubes.

According to the stainless steel metallographic structure, it is divided into semi-ferrite and semi-martensitic stainless steel seamless tubes, martensitic stainless steel seamless tubes, austenitic stainless steel seamless tubes, austenitic-ferritic iron stainless steel seamless tubes, etc. .

Specification and appearance quality

A. According to GB14975-2002 “Stainless Steel Seamless Steel Pipe”, the length of the steel pipe is usually 1.5 to 10m (unfixed length), and the hot extruded steel pipe is equal to or greater than 1m. The cold-drawn (rolled) steel pipe wall thickness is 0.5 ~ 1.0mm, 1.0 ~ 7m; the wall thickness is greater than 1.0mm, 1.5 ~ 8m.

B. There are 45 types of hot-rolled (hot-extruded) steel pipes with diameters ranging from 54 to 480 mm; and 36 types with wall thicknesses of 4.5 to 45 mm. There are 65 types of cold drawn (rolled) steel pipes with diameters ranging from 6 to 200 mm; and 39 types with wall thicknesses ranging from 0.5 to 21 mm.

C. There should be no cracks, folds, cracks, cracks, folds, delamination, and scarring defects on the inner and outer surfaces of the steel pipe. These defects should be completely removed (except for mechanical processing tubes). The diameter exceeds the negative deviation. Other minor surface defects not exceeding the allowable negative deviation may not be removed.

D. Straights allow depth. Hot-rolled and hot-extruded steel pipes, diameters less than and equal to 140mm, no more than 5% of the nominal wall thickness, maximum depth not more than 0.5mm; cold drawn (rolled) steel pipes, no more than 4% of the nominal wall thickness, maximum depth not more than 0.3 mm.

E. Both ends of the steel pipe should be cut at right angles and burrs should be removed.

Manufacturing process of stainless steel seamless pipe

1. Hot rolling (extruded seamless steel pipe): round tube billet → heating → perforation → three-roller cross-rolling, continuous rolling or extrusion → tube removal → sizing (or reducing diameter) → cooling → straightening → hydraulic test (Or flaw detection) → mark → storage

The raw material for rolling the seamless tube is a round tube blank. The round tube blank is cut by a cutting machine into a blank with a length of about 1 meter, and is sent to the furnace for heating through a conveyor belt. The billet is fed into the furnace for heating at a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube billet is released, it needs to pass through the pressure piercing machine. The most common perforation machine is a tapered roller perforation machine. This kind of perforation machine has high production efficiency, good product quality, large perforation diameter and can wear a variety of steel types. After the piercing, the round tube blank is successively rolled, rolled or squeezed by three rolls. After squeezing, the tube should be calibrated. The sizing machine rotates into the steel embryo through the conical drill at high speed to form holes. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After sizing the steel pipe, it enters the cooling tower and is cooled by water spray. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. After the quality inspection of the steel pipes, strict manual selection is required. After the quality inspection of the steel pipes, spray paint with numbers, specifications, production batch numbers, etc. And lifted into the warehouse by crane.

2. Cold drawn (rolled) seamless steel tube: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet → heat treatment → straightening →Hydraulic test (flaw detection)→Marking→Storage.

The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolled (extruded seamless steel pipe). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the round tube blank is hollowed, it needs to be headed and annealed. After annealing, pick up with a special acidic liquid. After pickling, apply oil. Then it is followed by multi-pass cold drawing (cold rolling) and then billet tube, special heat treatment. After heat treatment, it will be straightened.

Product Features:

1. Chemical analysis: chemical analysis of the chemical composition of the material, the chemical composition conforms to the standard.

2. Air pressure. The water pressure test is carried out one by one for the pressure-resistant pipes. The hydraulic pressure test does not keep at the specified pressure value for not less than 5 seconds and does not leak. The conventional supply hydraulic pressure test is 2.45MPa. The air pressure test is P =0.5MPAa.

3. Corrosion test: The supplied industrial corrosion-resistant steel pipes are tested for corrosion resistance of the steel pipes according to the standard or the corrosion methods agreed by both parties, and there shall be no intergranular corrosion tendency.

4. Process performance inspection: flattening test, tensile test, impact test, flaring test, hardness test, metallographic test, bending test, nondestructive testing (including eddy current testing, X-ray testing and ultrasonic testing).

5. Theoretical weight:

Cr-Ni austenitic stainless steel W=0.02491S(D-S)

Cr-Ni-Mo austenitic stainless steel (kg/m) S-wall thickness (mm)

D-outer diameter (mm)



As a stainless steel seamless tube for reprocessing equipment, in order to control the chromium-carbon compound in the welding affected area as much as possible to reduce the carbon content, or limit the content of silicon and phosphorus in 310Nb steel. In addition, in the 304ULC steel, in order to improve the corrosion resistance in nitric acid, the steel industry that tries to limit the phosphorus content to 0.015% or less is manufactured. After repeated 20 times of 65% boiling nitric acid corrosion test, if the solution treatment material has a corrosion degree of 0.1mm/a or less, and the sensitized material at 650℃×2h has a corrosion degree of 0.2mm/a or less, , With excellent corrosion.

Ti-5a alloy with improved titanium and overall corrosion resistance has been used to manufacture U and Pu solution evaporation boilers and heat recovery evaporation boilers at the Tokai Reprocessing Plant in Japan. In addition, because zirconium has stable corrosion resistance in a nitric acid environment, zirconium was used in its continuous dissolution tank at the reprocessing plant in Rokkasho, Aomori Prefecture, Japan.


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  • Which is better ss304 or ss316?

    Since Type 316 stainless steel alloy contains molybdenum bearing it has a greater resistance to chemical attack than 304. Type 316 is durable, easy-to-fabricate, clean, weld and finish. It is considerably more resistant to solutions of sulfuric acid, chlorides, bromides, iodides and fatty acids at high temperature.
    What is good quality stainless steel?
    304 stainless steel is the most common form of stainless steel used around the world due to excellent corrosion resistance and value. 304 can withstand corrosion from most oxidizing acids. That durability makes 304 easy to sanitize, and therefore ideal for kitchen and food applications.

    What is the difference between 304, 304H and 304L?

    In fact, the content of chromium and nickel is 304 stainless steel, and the composition contains 18% chromium (Cr) and 8% nickel (Ni), but the main difference lies in the carbon content.

    304L is an ultra-low carbon stainless steel. The carbon content is reduced to less than 0.03%, which can avoid intergranular corrosion. In theory, the effect of stress corrosion resistance is stronger than that of 304, but the effect is not obvious in practical applications. The purpose of reducing carbon and adding titanium is the same, but the smelting cost of titanium-added 321 is higher, the molten steel is thick, and the price is more expensive.

    The H in 304H refers to high temperature. High carbon content is the guarantee of high temperature strength. GB150 requires that when austenitic steel is used above 525 degrees, the carbon content should not be less than 0.04%. Carbide is the strengthening phase, especially the high temperature strength. Better than pure austenite.

    Among the three, the highest carbon content is 304H, the lowest carbon content is 304L, and the carbon content of 304 stainless steel is between the two. The higher the carbon content, the worse the corrosion resistance of stainless steel and the easier it is to rust. The difference in carbon content also causes the price to be different, or the requirements for different uses are also different.

    Why is stainless steel so expensive?

    Stainless steel is more expensive to produce because of the addition of the variety of alloying elements, such as iron, chromium, nickel, manganese and copper. … The chromium attaches itself to oxygen more readily than iron and thus creates a chromium oxide layer which protects the metal from degradation.
    What is the safest stainless steel?
    Stainless steel cookware is generally recognized as a safe material for cookware. Any good quality stainless steel, be it 304 or 316 stainless steel, is a better choice than most of the other available materials. For example, coated aluminum pans lose their non-stick over time.