18Х2Н4МА - x19nicrmo4 - 1.6657 circle, rod, forging
Supplier — AvecGlob Company — offers at a reasonable price from the manufacturer a circle, rods, forgings, which are made of 18Х2Н4МА steel (x19NiСrMo4, 1.6657). The supplier guarantees the timely delivery of products to any address specified by the consumer /
Low-carbon steel grade 18H2N4MA (the closest foreign analogues are x19NiCrMo4, 1.6657) is a cemented structural steel alloyed with chromium, molybdenum, titanium and nickel. In Western Europe it is produced according to DIN EN 10084−1998. The presence in the steel of refractory metals increases its mechanical strength at elevated temperatures: the operating range of use is -70 0 C to +400 0 С.
Urgency of application
Steel grade 18H2N4MA (x19NiCrMo4, 1.6657) is widely used in control mechanisms and mechanical transmissions of ships, ground vehicles, aircraft, guided missiles, weapons systems. The use of this steel has a special effect in railway transport, in the construction of roads, bridges, pressure vessels, machine tools, other mechanical devices that have significant dimensions or cross-sections. In the energy sector, the reference steels for turbine boilers, especially critical fasteners, shafts operating in reversible modes, pinions of increased durability, rods, etc., are produced from the steel grades under consideration.
According to the technical requirements of GOST 4543−91, 18Х2Н4МА steel comprises the following elements (numerical data — in percentages):
|0.14 — 0.20||0.17 — 0.37||0.25 — 0.55||4.0 — 4.4||to 0.025||to 0.025||1.35 — 1.65||up to 0.3||0.3−0.4||Up to 0.06|
Physical and mechanical properties
- density, kg / m 3 — 7940;
- melting point, 0 С -1600;
- coefficient of thermal expansion in the temperature range 20… 100 0 С, μm / deg — 10,5;
- specific heat, J / grad — 506;
- modulus of elasticity, GPa — 200;
- coefficient of thermal conductivity in the temperature range 20… 100 0 С, W / mgrad — 36;
- Brinell hardness, НВ — 241;
- limit of time resistance, MPa — 880… 1130 (depending on the heat treatment mode);
- yield strength, MPa — 640… 835 (depending on the heat treatment regime);
- permissible tensile elongation,% — 12… 15.
Assortment and application features
The circle, rods and forgings made of alloy steel 18Х2Н4МА (x19NiСrMo4, 1.6657) are manufactured in a wide range of cross-sections and configurations. Mechanical machinability of steel is medium, weldability is poor. The material is sensitive to flock formation, but is not susceptible to brittleness after tempering. The temperature range of forging is 800… 1220 0 С.
Supplier — AvekGlob Company — offers to buy bar, circle or forgings from low-carbon structural steel 18Х2Н4МА (x19NiСrMo4, 1.6657) in the required assortment of cross-sections, weight and configuration. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.