Welded pipe surface quenching and tempering heat treatment is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardening layer depth. Hardness testing can use Vickers hardness tester, can also use Rockwell or surface Rockwell hardness. The choice of test force (scale) is related to the depth of the effective hardened layer and the surface hardness of the welded pipe. Here involves three hardnesses.
Brand identification
Chemical properties: high temperature resistance, low temperature resistance, acid resistance, alkalinity, oxidation resistance, etc.;
Process performance: filament stretching, fracture inspection, repeated bending, reverse bending, reverse flattening, two-way torsion, hydraulic test, flaring test, bending, crimping, flattening, ring expansion, ring stretching, microscopy Organization, cupping test, metallographic analysis, etc.;
Non-destructive testing: X-ray non-destructive testing, electromagnetic ultrasonic, ultrasonic, eddy current testing, magnetic flux leakage testing, penetrating testing, magnetic particle testing;
Mechanical properties: tensile strength, impact test, yield point, elongation after fracture, reduction of area, hardness index (Rockwell hardness, Brinell hardness, Vickers hardness, Leeb hardness, Webster hardness);
Other items: metallographic structure, inclusions, decarburized layer, microstructure content determination, corrosion cause analysis, grain size and microscopic rating, low power structure, intergranular corrosion, superalloy microstructure, high temperature metallographic structure Wait.
Comparative analysis, material identification, failure analysis, component analysis, chemical analysis

Failure analysis: fracture analysis, corrosion analysis, etc.;

Elemental analysis: accurate detection and analysis of manganese, oxygen, nitrogen, carbon, sulfur, silicon, iron, aluminum, phosphorus, chromium, vanadium, titanium, copper, cobalt, nickel, molybdenum, cerium, lanthanum in metals, alloys and their products, and stainless steel , Calcium, magnesium, zinc, tin, antimony, arsenic and other metal elements composition and content;