Introduction of materials used in fasteners

There are five kinds of materials used in fasteners:

•Alloy Steel

•Carbon steel (low carbon steel and medium carbon steel)

•Stainless Steel

•Copper and its alloys

•Aluminum and its aluminum alloy

1, alloy steel

Steel containing alloying elements is called alloy steel, and is divided into the amount of alloying elements: from the content of alloying elements:

Low alloy steel: the total amount is less than 5%

Medium alloy steel: the total amount is 5%-10%

High alloy steel: the total amount is higher than 10%

From the main elements contained in the alloy can be divided into: chromium steel, chromium nickel steel

Manganese steel, silico-manganese steel, etc. Related numbers are: 30Cr 35Cr 40Cr

20CrMn 30CrMo 35CrMoA 20CrMoA 21CrMoA

20CrMovTiB 20CrMoVNbTiB 20CrMoV (Guide: The main application of the best solution to loosen fasteners)

21Cr12wMoVNbB Gh2132 35CrMo 42CrMo

2, carbon steel

•Low carbon steel: carbon content is less than or equal to 0.25%, the relevant steel grades are Q215 Q235 Q195 10# 15# 20#

•Medium carbon steel: The carbon content is greater than 0.25% and less than or equal to 0.6%, and the relevant steel grades are 35# 45#

•High-carbon steel: The carbon content is greater than 0.6%. At present, our company uses high-carbon steel at the end of the standard parts.

3, stainless steel

Stainless steel is a material with anti-corrosion properties such as alloying elements Cr Ni Ti. It is divided into austenitic stainless steel, such as A2 (304 series stainless steel), A4 (316 series stainless steel), 301 and 302 series stainless steel. Austenitic- Ferritic stainless steel such as: 0Cr26Ni5Mo2 1Cr18Ni11Si4AlTi. Ferritic stainless steel, such as: 00Cr12 1Cr17 0Cr3Al. Martensitic stainless steel, such as: 2Cr13 3Cr13 4Cr13

4. Copper and copper alloys

The commonly used copper and copper alloys in fasteners are:

T2 H63 HPb59-1

QSn6.5-0.4 QSi1-3

QAl10-4-4

5. Aluminum and aluminum alloy

The commonly used aluminum and aluminum alloys in fasteners are:

5A02 2B11

2A90 7A09

5A12 5A05

5A43

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