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Heat-Resistant Steel (YB/T 036.3-92)
Heat-resistant steel is used in many industries, including the nuclear power, aerospace, military, and automotive industries. Silicon steel is a common type of heat-resistant steel, and it uses its high content of silicon to gain its superior heat resistance. As this steel is used in a variety of applications, it has been subjected to many different regulations and standards, including the YB/T 036.3-92 standard. This standard applies to several types of heat-resistant steel, including martensitic, austenitic and ferritic types, as well as some special alloy steel grades for structural parts. This document sets out requirements for the composition, mechanical properties, heat treatment, and inspection of heat-resistant steel.
In the YB/T 036.3-92 standard, heat-resistant steel is classified into several types. Type 200, for example, is a ferritic heat-resistant steel made from cast iron or alloy steel, containing 12.5 percent of chromium. Type 300 is an austenitic heat-resistant steel containing 18 percent of chromium, 8 percent of nickel, and up to 0.06 percent of carbon. Type 500 is a martensitic heat-resistant steel containing 10 percent of chromium, 1.5 percent of molybdenum, and 0.2 percent of carbon. In all types, there are also restrictions on trace elements such as oxide, phosphorus, sulfur, and aluminum.
The YB/T 036.3-92 standard also includes requirements for the mechanical properties of heat-resistant steel. Depending on the type and application, different steel grades require specified tensile strength, yield strength, and longitudinal elongation. For example, Type 200 ferritic steel must have a minimum tensile strength of 690N/mm^2, a minimum yield strength of 490N/mm^2, and a minimum longitudinal elongation of 12 percent.
In order to ensure the desired mechanical properties, the YB/T 036.3-92 standard requires that heat-resistant steel is subjected to a proper heat treatment process before being put into use. Depending on the type of steel, different heat treatment processes are specified. For example, Type 300 austenitic steel must be annealed in a vacuum and cooled in a controlled atmosphere at a certain temperature to achieve maximum strength.
Finally, the YB/T 036.3-92 standard also sets out requirements for the inspection of heat-resistant steel. It calls for an inspector to first verify the chemical composition of the steel, followed by tests for hardness, tensile strength, and bending performance. Visual inspection and magnetic particle inspection are also part of the inspection process.
The YB/T 036.3-92 standard provides requirements for the production of several types of heat-resistant steel, covering their composition, mechanical properties, heat treatment, and inspection. In order to be sure that their steel meets all requirements, manufacturers must follow this standard closely, as failure to do so could lead to inferior strength and durability, leading to dangerous results in some applications.
