Classification of cast steel valves
Cast steel valves can be classified into carbon steel and alloy steel according to their chemical composition. It can also be divided into engineering and structure according to their use characteristics
Structural steel, alloy steel, special steel, tool steel and professional steel, etc. See table 3-1 for classification of cast steel. Than.
Table 3-1 classification of cast steel
According to casting
Low carbon steel (C ≤ 0. 25%)
Emptiness
Medium carbon steel (C: 0,25% ~ 0.60%
Chemical carbon steel
High carbon steel (C: 0.60% ~ 2.00%) is cast
Low alloy steel (total alloy elements ≤ 5%)
Development of medium alloy steel (5% ~ 10% of total alloy elements)（（
Alloy steel
High alloy steel (total alloy elements > 10%) deep
Engineering and structure
Long carbon structural steel
Cast steel is used
Alloy structural steel
Made of stainless steel
Heat resistant steel
For wear resistant steel
special steel
Gold changqite casting of nickel base alloy
Tool steel
Die steel
Professional casting steel
According to the international standard iso4948 / 1, steel can be classified into non alloy steel and alloy steel according to chemical composition. And in ISO 4948/
It is also stipulated in 2 that non alloy steel and alloy steel are classified according to the main quality grade, main performance and service characteristics. China's "division of steel"
It is equivalent to the classification method of ISO international standard, which can be divided into non alloy steel and alloy according to chemical composition
Steel; non alloy steel and alloy steel can be classified according to the main quality grade and main characteristics.
The classification of cast steel has not formed formal national and international standards. This manual is based on the characteristics of cast steel classification and reference steel
The classification standards are mainly introduced in five chapters, reflecting the classification method according to chemical composition and main characteristics.
Cast carbon steel and high strength steel for general engineering and structure
Cast medium and low alloy steel
Cast stainless steel and heat resistant steel
Cast wear resistant steel
Casting special steel and professional steel