201 Stainless Steel Pipe

201 Stainless Steel Pipe

201 Stainless Steel pipe 201 Stainless Steel pipe material, with the characteristics like acid and alkali resistance, high density, no bubbles after polishing, no pinhole and other characteristics. It is the high quality material for production of various watch cases, watch strap bottom covers....
Product description

201 Stainless Steel Pipe

201 Stainless Steel pipe material, with the characteristics like acid and alkali resistance, high density, no bubbles after polishing, no pinhole and other characteristics. It is the high quality material for production of various watch  cases, watch strap bottom covers. Mainly used as decorative tubes, industrial tubes and some shallow stretc material, with the characteristics like acid and alkali resistance, high density, no bubbles after polishing, no pinhole and other characteristics. It is the high quality material for production of various watch  cases, watch strap bottom covers. Mainly used as decorative tubes, industrial tubes and some shallow stretched products.

 

Features

Acid and alkali resistance

 

Usages

Decorative tubes, industrial tubes

 

Kinds

J1,J3,J4,201,202

 

Content

1. Chemical Composition

2. Development

3. Kinds

4. Physical Property

 

Chemical Composition

C ≤ 0.15

Si≤ 0.75

Mn: 5.5~7.50

Cr: 16.0~18.0

N ≤ 0.25

P ≤  0.060

S ≤0.030

Ni: 0.6-5.50%

Cu: Half Copper 0.8%

High Copper 1.5%

 

Development

201 Stainless Steel pipe was successfully developed firstly in the United States as the substitutes for the 300 series stainless steel pipe.  At that time, resulting to the war situation, nickel was strictly controlled as the strategic materials by related countries. America was then seriously insufficient of nickel supply. In order to solve the production and supply problems of stainless steel under the condition of serious nickel shortage, the United States developed a this new series of austenitic stainless steel, substituting nickel with manganese.

 

After the end of World War II, the United States nickel supply situation gradually improved, therefore, the production of 300 series stainless steel pipe is no longer restricted by raw material tension; so the 200 series has not been developed further. Several Indians who had participated in the development of 200 series stainless steel pipe, after returning to India from India, considering from country condition that India is state that relatively rich in manganese resources, lack of nickel resources, took back to India the 200 series stainless steel pipe varieties developed in the United States.


Disadvantages of this material series: The chromium content below 18% and low nickel content can not reach balance and form ferrite. Therefore, the chromium content of 200 series stainless steel pipe in down to 13.5% to 15%; in some cases dropped to 13% ~ 14%; its corrosion resistance is not match to 304 and other similar steels. What’s more, under the common acidic conditions, Mn and Cu decrease the repassivation effect in the corroded parts like sedimentary area and the seam. With that kinds of conditions, the damage velocity of 200 series steel was 10-100 times of that of 304 steel. In the production usually, the S and C content can not not be controlled; the material can not be traced or tracked, even in material recycling. So if the Cr-Mn steel is not stated, they will be dangerous scrap mixed material, and the forged piece will include unexpected high content of Mn.

 

Kinds

Now in China, we mainly have the following several 200 Series: J1, J3, J4, 201, 202. Later we have the 200 steels, which have lower nickel content. As for 201C, a few individual steel plant from China developed extension steel types of 201. The national standard grade of 201: old grade 1Cr17Mn6Ni5N, new grade 12Cr17Mn6Ni5N. 201C: reduce the content of nickel on the basis of 201 and increase the content of manganese.

 

Physical Properties

Tensile Strength: 520MPa

Yield Strength: 275MPa

Elongation: 55 to 60%

Elasticity Modulu: 29,000,000 psi  Equivalent as 203000MPa

Hardness Requirement(Brinell Hardness) HRB<183N/mm2(MPa)。

Density: 280lbs/cubic inch(Density: 7.93g/cm3)

 

 

 


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