35.5mm(1.397635"), Hot Sale Solid Stainless Steel Metal Ball For Bearing

35.5mm(1.397635"), Hot Sale Solid Stainless Steel Metal Ball For Bearing
 
Introduction

Stainless steel balls are usually produced through a stainless steel forging process. At present, the commonly used stainless steel balls are 201, 302, 304, 316, 316L, 420, 440C.

According to the organization state, stainless steel is usually divided into martensitic steel, ferritic steel, austenitic steel, austenitic-ferritic (duplex) stainless steel and precipitation hardening stainless steel. In addition, according to the composition can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel and so on.

Main features

Weldability, polishing performance, heat resistance, corrosion resistance

a.Among them, the main factors affecting polishing performance are as follows:
① Surface defects of raw materials. Such as scratches, pitting, pickling, etc.
②The problem of raw materials. If the hardness is too low, it will not be easy to polish during polishing (BQ is not good), if the hardness is too low, orange peel will easily appear on the surface during deep drawing, which will affect BQ. BQ with high hardness is relatively good.
③After deep drawing, small black spots and bumps will appear on the surface of the extremely deformed area, which will affect the BQ.

b. Heat resistance refers to the ability of stainless steel to maintain its excellent physical and mechanical properties at high temperatures.

c. When the number of chromium atoms in the steel is not less than 12.5%, the electrode potential of the steel may suddenly change from a negative potential to a positive potential. Prevent electrochemical corrosion.

Structure composition

The corrosion resistance of stainless steel decreases as the carbon content increases. Therefore, the carbon content of most stainless steels is low, the maximum value does not exceed 1.2%, and the ωc (carbon content) of some steels is even lower than 0.03% (for example, 00Cr12). The main alloying element in stainless steel is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, stainless steel usually has a Cr (chromium) content of at least 10.5%. Stainless steel also contains elements such as Ni, Ti, Mn, N, Nb, Mo, Si and Cu.

Magnetic

The austenitic type is non-magnetic or weakly magnetic, and martensite and ferrite are magnetic. After austenite is cold-worked, its structure will also be transformed into martensite, and the magnetic properties will become larger. Therefore, the method of distinguishing the quality and the authenticity of stainless steel through magnet adsorption is one-sided and wrong.

International stainless steel marking method

The American Iron and Steel Institute uses three digits to indicate various standard grades of forgeable stainless steel. among them:
①Austenitic stainless steels are marked with 200 and 300 series numbers. For example, some common austenitic stainless steels are marked with 201, 304, 316 and 310.
②Ferritic and martensitic stainless steels are represented by numbers in the 400 series.
③Ferritic stainless steel is marked with 430 and 446, and martensitic stainless steel is marked with 410, 420 and 440C.
④ Duplex (austenite-ferrite), stainless steel, precipitation hardening stainless steel, and high alloys with iron content less than 50% are usually named by patent names or trademarks.