ASTMA453 GR660, also known as 17-7PH, is a high-temperature material, which belongs to the precipitation hardening type (precipitation hardening stainless steel refers to the addition of different types and quantities of strengthening elements on the basis of the chemical composition of stainless steel, and the precipitation of different types and quantities of carbides, nitrides, carbonitrides and intermetallic compounds through the precipitation hardening process, which not only improves the strength of the steel but also maintains sufficient toughness, referred to as PH steel. Precipitation hardening stainless steel can be divided into three categories: martensitic type, semi-austenite type and austenite type according to the metallographic structure of its matrix), high-temperature materials. This material has high strength and hardness, and at the same time has good high-temperature performance and corrosion resistance. It is commonly used in the manufacture of mechanical components under high temperature conditions, such as engine parts, turbines, valve equipment, medical equipment, etc.
ASTMA453 GR660 chemical composition C 008% mn ≤2.00% si≤ 1% mo 1～1.5% ni 24～27% cr 13.5～16% ti 1.9～2.35% al ≤0.35% v 0.1～0.5% p≤ 0.045% s≤ 0.03%。
One person and one sentence cheer for the graduate school entrance examination ASTMA453 GR660 commonly used surface treatments include natural color and Teflon treatment. Natural color treatment can make the material maintain the original metallic luster, while Teflon treatment can form a thin film on the surface of the material, which has excellent heat resistance, cold resistance, moisture resistance, corrosion resistance and insulation properties. This treatment method can make the material have better wear resistance, acid and alkali resistance, corrosion resistance and other properties, and is suitable for some application scenarios that require high strength and high durability.