有哪些信誉好的足球投注网站第3章金属材料金属材料是最重要的工程材料,工业上将金属及其合金分为（The third chapter, metal materials, metal materials is the most important engineering materials, industrial metals and alloys are divided into）_精品.doc
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第3章金属材料金属材料是最重要的工程材料,工业上将金属及其合金分为（The third chapter, metal materials, metal materials is the most important engineering materials, industrial metals and alloys are divided into）_精品
第3章金属材料金属材料是最重要的工程材料,工业上将金属及其合金分为（The third chapter, metal materials, metal materials is the most important engineering materials, industrial metals and alloys are divided into）
The third chapter of metal materials
The metal material is the most important engineering materials, industrial, metal and alloy are divided into two categories:
Black metal iron and iron based alloy (steel, cast iron and iron alloy);
Nonferrous Metals -- including all metal black metal and its alloy outside.
The metal material in 95% for iron and steel, iron and steel engineering performance is superior, the price is cheap, the most widely used metal materials engineering. According to the classification of chemical composition of steel, carbon steel and alloy steel are divided into two categories.
3.1 carbon steel
In the industrial use of steel materials, steel plays an important role. The iron carbon alloy, alloy carbon mass fraction is greater than 0.02% and less than 2.11% for steel, carbon content of common carbon steel is generally less than 1.3%, its strength and toughness are good. Compared with the alloy steel, carbon steel smelting process is simple, easy, cheap, and can satisfy the performance requirements in general, so it is widely used.
The composition and classification of 3.1.1 steel 1. steel components of the actual use of carbon steel, except Fe, C of two main elements, impurity elements also contain a small amount of Mn, Si, S, P, H, O, N and other non specifically added. They have great influence on steel properties and quality, must be strictly controlled within the scope of the provisions of the trademark.
The classification of 2. carbon steel
There are several classification methods of carbon steel:
(1) according to the mass fraction of carbon steel for low carbon steel -- F W F (C) = 0.25%
Medium carbon steel --0.25% (C) w f f = 0.6%
High carbon steel -- F W F (C) 0.6%
(2) according to the quality of the steel is divided into ordinary carbon steel - F W F (S) = 0.0
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