The hardness test is to slowly press a hard indenter into the surface of the sample with a durometer under specified conditions, and then test the depth or size of the indentation to determine the hardness of the material. Especially for those materials whose shape is not convenient for hardness test, tensile strength test becomes the only means of testing mechanical properties. Almost all metal materials require tensile test as long as they have requirements for mechanical properties. Tensile strength test is the most basic test method for mechanical properties of metal materials. Tensile strength test is to make a sample of stainless steel pipe, pull the sample to break on a tensile testing machine, and then measure one or several mechanical properties, usually only the tensile strength, yield strength, elongation after fracture and section are measured Shrinkage. Tensile test and hardness test of stainless steel pipe? The stainless steel pipe after this furnace-type heat treatment has no scratches and good brightness surface. Using gas fuel or electric heating, various protective gases can be used. Equipped with convection cooling system for fast cooling. It can also be used to process capillary tubes in coils. The length of the steel pipe can be up to 40m. The hourly output is about 0.3 to 1.0 Tons. This bright annealing furnace type is suitable for small-diameter thin-walled precision special-shaped stainless steel pipes.
(2) Mesh belt type bright annealing heat treatment furnace. It can be equipped with a convection cooling system to cool the special-shaped stainless steel tube faster. The protective gases that can be used are high-purity hydrogen, decomposed ammonia and other protective gases. This bright annealing furnace type is suitable for heat treatment of large-size and large-volume special-shaped stainless steel pipes, with an hourly output of above 1.0 Tons. (1) Roller-type bright annealing heat treatment furnace. The adoption of this heat treatment process not only improves the surface of stainless steel pipes, but also overcomes the environmental pollution caused by pickling.Īccording to the manufacturer of stainless steel pipes, according to the current world development trend, bright annealing continuous heat treatment furnaces are basically divided into the following two types:
As a bright surface without oxidation can be obtained, the traditional pickling process is eliminated. Heat treatment technology of stainless steel pipe surfaceįor the heat treatment technology of the surface of stainless steel pipes, non-oxidation continuous heat treatment furnaces with protective gas are generally used abroad for intermediate heat treatment and final heat treatment of finished products. Normal chemical composition of stainless steel Grade A789 – Seamless and Welded Stainless Steel Tubing for General Service.A688 – Welded Austenitic Stainless Steel Feedwater Heater Tubes.A270 – Seamless and Welded Stainless Steel Sanitary Tubing.A269 – Seamless and Welded Austenitic Stainless Steel Tubing for General Service.A268 – Seamless and Welded Stainless Steel Tubing for General Service.A249 – Welded Stainless Steel Boiler, Super heater, Heat Exchanger, and Condenser Tubes.A213 – Seamless Stainless Steel Boiler, Super heater, and Heat-Exchanger Tubes.Also used in producing all kinds of conventional weapons, the barrel, artillery shells and so on. In addition, engaging in bending, torsional strength of the same, lighter, and they are also widely used in the manufacture of mechanical parts and engineering structures. Stainless Steel Tube is a hollow steel bar, a large number of pipes used for conveying fluids, such as oil, gas, water, gas, steam,heat exchanger,mechinical machine. Stainless steel tube is typically measured by its outer diameter and can be used in a variety of applications including a number of structural applications.
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