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Steel Engineering Materials selection needs attention?

Source: Time:2016-01-20 11:51:34 浏览次数:

Mechanical properties of steel materials testing to determine the mechanical properties of the materials used meets the relevant national standards, the mechanical properties are: strength properties, plastic properties of materials, impact toughness, modulus of elasticity, cold properties, hardness, etc. . For the welding material, but also at the same time test their welding properties (including the construction and use of the weldability possibility) compliance with the respective...

Steel construction materials can be divided into three categories. That structure (member) of the material used, the structure of the connecting material (welding material) and structural maintenance of the materials used.
1. Steel building materials means structural load-bearing materials, including the main force structure steel, structural materials such as aluminum and connected with the main contents of the following structural materials testing.
1) the mechanical properties of test steel building materials.
Mechanical properties of steel materials testing to determine the mechanical properties of the materials used meets the relevant national standards, the mechanical properties are: strength properties, plastic properties of materials, impact toughness, modulus of elasticity, cold properties, hardness, etc. .
For the welding material, but also at the same time test their welding properties (including the construction and use of the weldability possibility) compliance with the respective national standard.
2) Analysis of the chemical composition of steel materials.
Through chemical analysis of the material, to determine whether the structure of the chemical composition of materials in line with the relevant provisions of national standard, imported materials should be appropriate national or international standards (ISO) regulations.
3) Metallurgical Steel Materials.
Of structural materials for metallurgical analysis to determine Building materials low magnification (fracture) organizations, non-metallic inclusions whether symbol GB regulations.
4) physical Steel Materials.
Physical analysis to determine the density of the material, the modulus of elasticity, linear expansion coefficient, thermal conductivity, an internal lack of material and the like.
5) The surface quality of steel material.
Surface quality of the material is one of the technical requirements of the standard content material, surface quality including materials (profiles) surface cracks, holes, scarring, and other off-sheng and inclusions, surface quality of the material shall comply with relevant national standards.
2. The welding material testing.
Welding materials are mainly welding rod, wire, flux.
1) detecting electrode. Testing include electrode size, deposited metal chemical composition, mechanical properties of deposited weld metal, seam-ray detection, electrode coating, drug skin moisture. Stainless steel welding rod, there should be measured weld metal corrosion resistance, hydrocarbon metal ferrite content.
2) wire detection. The chemical composition of testing include wire, wire mechanical properties and radiographic inspection, wire diameter and deviation, wire stiffness, wire coating, wire diameter and Alice from relaxation, smoothness butt welding, wire surface quality and mechanical properties of deposited metal impact test weld-ray detection.
3) flux testing. Including solder inspection side Ying granularity, moisture flux, solder moisture resistance, mechanical inclusions, Pan process performance, deposited metal tensile properties of the deposited metal V-notch impact energy, welding test plate ray detection, agent sulfur and phosphorus content, diffusible hydrogen content of the weld. All test items shall comply with the appropriate national standard.
3. steel building structures protection materials testing.
Structural protection material refers to a material form the structure surface protection film, mainly corrosion and rust paint and fire retardant paint. Test content including the chemical composition of coatings, physical properties (kill degrees, in the dry time, brine, etc.) deposition surface gloss, properties, corrosion resistance and coating surface quality measurement and so on.
Coating performance tests should be conducted Xu material coating tests.

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