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the steel structure engineering inspection of China Metallurgical Construction Research Institute (Shanghai) Co
, Ltd
includes all the specified test and inspection contents of raw materials, welding materials, weldments, fasteners, welds, bolt ball joints, coatings and other materials and projects of steel structures and special equipment
It mainly includes: Nondestructive Testing of steel structures, engineering testing of main structures, mechanical property testing of steel structures, mechanical property testing of steel fasteners, chemical composition analysis of steel, testing of coating raw materials, salt spray test, etc

1、 Mechanical property test
1
Mechanical property test of steel structure:
a
Metal raw materials such as steel plate and round steel tensile testing (tensile strength, yield strength, elongation after fracture), bending test, impact test (normal temperature impact, low temperature impact, aging impact), hardness and other toughness and plastic properties testing, reinforcement tensile testing (yield strength, tensile strength), bending and other properties
Z-direction tensile test of steel plate

b
Welding procedure qualification of metal weldments, tensile and bending tests of steel weldments

c
Metal hardness test is the ability of metal to resist local deformation, especially plastic deformation, indentation or scratch
It is an index to measure the hardness and softness of metal materials
Hardness includes Vickers hardness, Leeb hardness, Rockwell hardness and Brinell hardness

2
Mechanical property test of steel structure fasteners
Torque coefficient of bolt connection pair, tightening axial force, tension (yield strength, tensile strength), wedge load test, load retaining test of bolt nut, hardness of bolt bolt washer and other properties, anti slip coefficient of bolt connection plate

2、 Chemical composition analysis of steel
The chemical composition analysis of steel is divided into spectral analysis and wet analysis
The chemical analysis elements include: C, P, Si, Mn, Cr, Ni, Cu, Mo, V, Ti, Al, Nb, W, B

3、 Coating raw material inspection
1
Routine testing of coatings, interior and exterior wall coatings, fire-proof coatings, and anti-corrosion coatings
Routine testing items include: state in the container, color and appearance, viscosity, outflow time, fineness, specific gravity, hiding power, drying time, nonvolatile content, specular gloss, hardness, flexibility, bending resistance, adhesion, impact resistance, water resistance, chemical reagent resistance, heat resistance, sagging, moisture and heat resistance, wear resistance Salt spray resistance and aging resistance

2
Steel structure coating quality inspection, routine inspection items include: steel structure coating appearance inspection, steel structure coating adhesion inspection, steel structure coating thickness inspection

4、 Salt spray test
Salt spray test is an environmental test that mainly uses the artificial simulated salt spray environmental conditions created by salt spray test equipment to evaluate the corrosion resistance of products or metal materials
The purpose of salt spray test is to assess the salt spray corrosion resistance quality of products or metal materials
The judgment methods of salt spray test results include: rating judgment method, weighing judgment method, corrosion occurrence judgment method, and corrosion data statistical analysis method

Salt spray test mainly includes: neutral salt spray test (NSS test), salt spray test (SS test), acetate spray test (ASS test), copper accelerated vinegar instinct test, high temperature damp heat test

5、 Nondestructive testing
MCC Construction Research Institute (Shanghai) Co
, Ltd
is subordinate to MCC, Nondestructive testing (NDT) is the general term of all technical means that use the characteristics of sound, light, magnetism and electricity to detect whether there are defects or nonuniformity in the tested object, give the size, location, nature and quantity of defects, and then determine the technical state of the tested object (such as qualified or not, residual life, etc
) without damaging or affecting the service performance of the tested object

Testing methods include: ultrasonic testing (UT), radiographic testing (RT), magnetic particle testing (MT), and penetrant testing (PT)
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