What Material Is 347 Stainless Steel?

What material is 347 stainless steel?

347 stainless steel pipe is a grade of stainless steel produced in accordance with American ASTM standards. 347 stainless steel pipe is equivalent to my country's 0Cr18Ni11Nb stainless steel pipe.

A kind of high-alloy steel that can resist corrosion in the air or chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as color plating, but can utilize the inherent surface properties of stainless steel and is used in many applications. A type of steel, often called stainless steel. Representative performance include 13 chromium steel, 18-8 chromium-nickel steel and other high alloy steels.

From a metallographic perspective, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film isolates the oxygen that intrudes into the steel and plays a role in corrosion resistance. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium.

347 stainless steel pipe: 18% chromium, 11% nickel

347 contains tantalum plus niobium and is mainly used for welded parts used at high temperatures.

347 stainless steel pipe = 0Cr18Ni11Nb contains Nb to improve resistance to intergranular corrosion, improves strength, and does not reduce plasticity. Reduce the thickness of the material. As a structural strength component.

347 stainless steel pipe heat treatment: solid solution treatment (℃) 980-1150 rapid cooling

Mechanical properties of 347 stainless steel pipe austenitic steel after solution treatment (GB/T4237-92) yield strength ≥205/MPa, tensile strength ≥520/MPa, elongation ≥35%, hardness test: HBS≤187 , HRB≤90, HV≤200

The chemical composition of 347 stainless steel pipe is C≤0.08, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.030, Ni=9~13, Cr=17.00~19.00, Nb≥5*C%