Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008
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1、Structure of Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008 Description：
Stainless steel welded pipe is actually a cover term, covering a wide range of alloy and making them suitable for different attributes that are used in a very wide and large numbers of different industries. Stainless steel pipe is resistant to erosion, highly flexible, powerful, easy to use, and can be done in distinct approaches, which means that more and more stainless steel was used as a construction material for large-scale, high impact buildings. It can be molded, rolling, and it can create amazing shapes to make it perfect, It is used as experimental buildings, The use of steel pipe welding of large stainless steel covers other examples.
2、Main Features of the Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008：
• High manufacturing accuracy
• High strength
• Small inertia resistance
• Strong heat dissipation ability
• Good visual effect
•Reasonable price
3、Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008 Images：
4、Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008 Specification：
composition of duplex stainless pipe（%）
| Steel grade | C≤ | Mn≤ | Si≤ | S≤ | P≤ | Cr | Ni | Mo | Cu≤ | N |
| S32750((SAF2507) 00Cr22Ni7Mo4N | 0.03 | 1.20 | 0.80 | 0.020 | 0.035 | 24.0/ 26.0 | 6.0/ 8.0 | 3.0/ 5.0 | 0.50 | 0.24/ 0.32 |
| S31803（SAF2205） 00Cr22Ni5Mo3N | 0.03 | 2.00 | 1.0 | 0.02 | 0.030 | 21.0/ 23.0 | 4.50/ 6.50 | 2.50/ 3.50 | 0.08/ 0.20 | |
| S31500（3RE60） 00Cr18Ni5Mo3Si2 | 0.03 | 1.2/ 2.00 | 1. 4/ 2.00 | 0.030 | 0.030 | 18.0/ 19.0 | 4.25/ 5.25 | 2.50/ 2.00 | 0.05/ 0.10 |
Mechanical Properties of duplex pipe：
| Steel Grade | Heat Treatment Temperature ℃ | Ab（MPa）≥ | As（MPa）≥ | ∮≥ | brinell | rockwell |
| S32750（SAF2507） 00Cr22Ni5Mo3N | 1025-1125 water | 800 | 550 | 15 | 310 | 32 |
| S31803（SAF2205） 00Cr22Ni5Mo3N | 1020-1100 | 620 | 450 | 25 | 290 | 30.5 |
| S31500（3RE60） 00Cr18Ni5Mo3Si2 | 980-1040 | 630 | 440 | 30 | 290 | 30.5 |
Details：
Outer Diameter | 6mm--159mm | |||||
Thickness | 0.3mm - 3.0mm | |||||
Length | 6m or as customers' request | |||||
Surface | 180G, 320G, 400G Satin / Hairline 400G, 500G, 600G or 800G Mirror finish | |||||
Application | Decoration construction, upholstery, industry instrument | |||||
Test | Squash test, extended test, water pressure test, crystal rot test, heat treatment, NDT | |||||
5、FAQ of Stainless Steel Welded Pipe duplex ASTM A790/ASTM A789 GB/T21832-2008：
①How is the quality of your products?
Our products are manufactured strictly according to national and internaional standard, and we take a test on every pipe before delivered out. If you want see our quality certifications and all kinds of testing report, please just ask us for it.
Guaranteed: If products’ quality don’t accord to discription as we give or the promise before you place order, we promise 100% refund.
②How about price?
Yes, we are factory and be able to give you lowest price below market one, and we have a policy that “ for saving time and absolutely honest business attitude, we quote as lowest as possible for any customer, and discount can be given according to quantity”,if you like bargain and factory price is not low enough as you think, just don’t waste your time.Please trust the quotation we would give you, it is professional one.
③Why should you chose us?
Chose happens because of quality, then price, We can give you both.Additionally, we can also offer professional products inquiry, products knowledge train(for agents), smooth goods delivery, exellent customer solution proposals.Our service formula: good quality+good price+good service=customer’s trust
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem.
Any question, pls feel free to contact us !
- Q:304 stainless steel, welded to seamless difference in what place?
- The grain size of the metal is related to the temperature of heat treatment and the time of keeping the same temperature. The welded stainless steel pipe and seamless stainless steel tube as the annealed grain size. If the minimum tube cold treatment, the grain size of the weld metal is smaller than the grain size, welding or grain size is the same.
- Q:Stainless steel and stainless steel pipe inside and outside polishing off, what is the difference?
- Ordinary stainless steel is in the chemical grade, and the ordinary pickling surface looks white. Mainly used in petrochemical, sewage treatment and other industries.
- Q:What kind of stainless steel square tube is used in ordinary square tubes?
- Stainless steel square tube is a kind of hollow long strip steel, because the section is square, so it is called square pipe. As the pipe conveying fluid, such as oil, gas, water, gas, steam, in addition, the bending and torsional strength of the same, the weight is light, so it is widely used in the manufacture of machinery parts and engineering structures.
- Q:Stainless steel heating oven tube after treatment is heating blue will not be red?
- Because sometimes we do tubular heater, in order to better improve its life, will reduce the heating pipe surface power, but it itself heating speed is slow, take more time to reach the temperature you want.
- Q:Stainless steel welded pipe or seamless pipe expensive?
- Stainless steel is generally divided into three categories: martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel. The price is roughly the same order as stainless steel. But each category has a cheaper and more expensive one, and the difference can be great.
- Q:Stainless steel pipe is mainly used in what areas?
- The stainless steel pipe is a kind of economic section steel, is one of the most important products in the steel industry, which can be widely used in industrial and living decoration on the market, a lot of people for the production of staircase handrails, railings, window, furniture etc.. There are two kinds of materials, 201 and 304.
- Q:The difference between stainless steel pipe and stainless steel composite pipe
- Stainless steel pipe is a kind of hollow long strip round steel, mainly used in petroleum, chemical, medical, food, light industry, machinery, instrument and other industrial pipeline and mechanical structure parts. In addition, the bending and torsional strength of the same weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also used to produce all kinds of conventional weapons, guns, shells and so on.
- Q:Stainless steel seamless steel tube, ordinary seamless steel pipe, which is good?
- The general stainless steel tube is wear-resistant, high temperature resistance, corrosion resistance. Plain carbon steel seamless tubes resist pressure better than stainless steel.
- Q:How much is one ton of stainless steel pipe?
- Basically, each shop is not the same, each place is not the same, you can ask more about the goods than three?
- Q:What's the difference between stainless steel pipe and stainless steel composite pipe?
- Stainless steel is also divided into several kinds of 200201300301304,The market is generally 301 material, 304 of the best results, followed by 301.
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