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Seamless Stainless Steel Tube
Seamless Stainless Steel Pipe
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Name
Seamless Stainless Steel Tube
Grade
ASTM201;ASTM304/304L;ASTM310S;ASTM316/316L;ASTM321
Standard
ASTM/DIN/GB/JIS/AISI
Surface
No.1/2B/BA/NO.4/6K/8K/HL(Hairline)/Matting
Payment Term
T/T;L/C;Western Union;Paypal
Delivery Time
7-15 days upon receipt of the deposit
Package
Standard Export Packing or As Customers Requirement
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Product introduction

SUBTITLE

Stainless steel seamless tube/pipe

Introduction:

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.

species:

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)

application:

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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Product details

Product details

 Seamless Stainless Steel Tube

Sesmless Staninless Steel Tube/Pipe
Product:Sesmless Staninless Steel Tube/Pipe
Material:Stainless Steel 200 series,300series,400series
Standard:ASTM/AISI/DIN/JIS/GB….
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 
MOQ:1TON
Package:Standard Export Packing,Or As Per Your Requirement
Application:Railings,Staircase Railing Balustrade,Windows,Balustrsde System,Equipment Manufacturing and Maintenance,etc.

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Mechanical Property
ASTMTS(Mpa)≥YS(Mpa)≥EL(%)≥Hardness
HBHRB
20152027540241100
2025202754020795
3015202054020795
304520205402090
304L4801754018790
309S5202054018790
3105202054018790
310S5202054018790
3165202054018790
316L4801754018790
316Ti5202054018790
317L4801754018790
3215202054018790
4304502052218388
904L49021635

2205640
25

Chemical Composition


Chemical Composition(%)
CSiMnPSNiCrMoCuNOther
1Cr17Mn6Mi5N2010.151.00 5.5-5.70.06 0.03 3.3-3.516-18__0.05-0.25
1Cr18Mn8Mi5N2020.151.00 7.5-100.06 0.03 4.0-6.017-19__0.05-0.25
1Cr18Mn8Mi5N3010.151.00 2.00 0.07 0.03 6.0-8.016-18__0.10 
0Cr18Ni93040.071.00 2.00 0.0350.03 8.1-10.017-19___
0Cr18Ni9309S0.081.00 2.00 0.0350.03 12.0-15.022-24___
0Cr25Ni20310S0.081.00 2.00 0.0350.03 19.0-22.024-26___
0Cr17Ni12Mo23160.081.00 2.00 0.0350.03 10.0-14.016-18.52.0-3.0__
00Cr17Ni14Mo2316L0.081.00 2.00 0.0350.03 12.0-15.016-182.0-3.0__
0Cr18Ni12Mo3Ti316Ti0.081.00 2.00 0.0350.03 11.0-14.016-192.5-3.5__Ti≥5C
0Cr18Ni12Mo3Ti317L0.031.00 2.00 0.0350.03 11.0-15.018-203.0-4.0__
1Cr18Ni9Ti3210.121.00 2.00 0.0350.03 8.0-11.017-19___Ti5C-0.70
1Cr124300.121.00 2.00 0.0350.03 0.60 16-18___
00Cr20Ni25Mo4.5Cu904L0.021.00 2.00 0.0350.03 23.0-28.019-234.0-5.01.0-2.00.14-0.20
00Cr2Ni5Mo3N22050.031.00 2.00 0.0350.02 4.5-6.521-232.5-3.5__
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

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