Check 304 Stainless Steel Grade
Check 304 Stainless Steel Grade
Check 304 Stainless Steel Grade
Check 304 Stainless Steel Grade

Check 304 Stainless Steel Grade

304 stainless steel how to identify?
Special steel inspection potion, this potion can be purchased in the general hardware store, so we can not worry about the problem of supply. 304 stainless steel, it is tested by the liquid in 3-5 is not discoloration, 201 stainless steel, the liquid will turn dark brown red in an instant.

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Product Introduction

How to nitride 304 stainless steel pipe?

The key to nitriding 304 stainless steel pipe is to remove its passivation film, passivation film is the reason why 304 stainless steel pipe rust prevention and can not nitride, so to make 304 stainless steel pipe nitriding, the key is to remove the passivation film on the surface. The methods of removing passivated film are chemical and mechanical. 1. The sandblasting workpiece is sandblasted with fine sand at a pressure of 0.15-0.25mpa before nitriding, until the surface is dark gray, and the dust on the surface is immediately put into the furnace.

2. Phosphating

Phosphating the workpiece before nitriding can destroy the oxide film on the metal surface and form a porous and loose phosphating layer, which is conducive to the infiltration of nitrogen atoms.

3. Chloride bubble

The Square Pipe Association today announced the effective removal of oxide film with chloride blister or coating of sandblasted or finished workpieces. Commonly used chlorides are TiCl2 and TiCl3.

Usually nitriding treatment of ferritic, martensitic and austenitic 304 stainless steel pipe and heat-resistant steel.

Chemical method