随着科学技术和工业的发展，对材料提出了更高的要求，如更高的强度，抗高温、高压、低温，耐腐蚀、磨损以及其它特殊物理、化学性能的要求，碳钢已不能完全满足要求。

With the development of science and technology and industry， the material has put forward higher requirements，工字钢生产厂家， such as higher strength， high temperature，工字钢， high pressure， low temperature，工字钢采购， corrosion resistance， wear and other special physical and chemical properties， carbon steel can not fully meet the requirements.

选择胶合板主要看其甲醛释放量和胶合强度。如果胶合板的胶合强度不好，容易散架。选择时注意胶合板的标称厚度与实际厚度是否相符。

The choice of plywood mainly depends on its formaldehyde emission and bonding strength. If the gluing strength of plywood is not good， it is easy to fall apart. When choosing， pay attention to whether the nominal thickness of plywood is in line with the actual thickness.

合金元素与铁、碳的相互作用

合金元素加入钢中后，主要以三种形式存在钢中。即：与铁形成固溶体；与碳形成碳化物；在高合金钢中还可能形成金属间化合物。

The interaction of alloying elements with iron and carbon

When alloy elements are added to steel， they mainly exist in three forms. Namely: to form a solid solution with iron; carbide and carbon; in high alloy steels are also likely to form intermetallic compounds.