Effect of Rolling Process on ASTM A242 Type 1 Steel Surface Scale

ASTM A242 Type1 steel is widely used in railway, construction, bridge and other fields. Its alloy composition contains a small amount of copper, brocade, Ming and other elements, and a dense protective film will be formed on the surface during use to prevent further erosion of the substrate by the corrosive medium.

Railway vehicles are constantly subjected to atmospheric corrosion and dynamic load abrasion during use, and ASTM A242 Type 1 steel is required to have high reliability, long life, and lightweight properties. With the development of railway modernization, the body materials of railway vehicles begin to develop towards high-strength atmospheric corrosion-resistant steel.

The main problem in production is that there are large areas of red rust-like scale and willow-like scale indentation defects on the surface of ASTM A242 Type1 steel. By adjusting the rolling process parameters such as furnace time, descaling passes, rough rolling outlet temperature, hot coil box mode, etc., the solution to ASTM A242 Type1 steel surface scale is studied.

By increasing the outlet temperature of rough rolling of ASTM A242 Type1 steel, the red rust-like scale disappears; controlling the outlet temperature of rough rolling, shortening the furnace time, increasing the number of descaling passes, and adopting straight-through mode rolling are beneficial to the improvement of willow-like scale, the excision rate of willow-shaped iron oxide scale decreased from 3.48% to 0.2%.

ASTM A242 Type1 steel is widely used in railway, construction, bridge and other fields. Its alloy composition contains a small amount of copper, brocade, Ming and other elements, and a dense protective film will be formed on the surface during use to prevent further erosion of the substrate by the corrosive medium.

Railway vehicles are constantly subjected to atmospheric corrosion and dynamic load abrasion during use, and ASTM A242 Type 1 steel is required to have high reliability, long life, and lightweight properties. With the development of railway modernization, the body materials of railway vehicles begin to develop towards high-strength atmospheric corrosion-resistant steel.

The main problem in production is that there are large areas of red rust-like scale and willow-like scale indentation defects on the surface of ASTM A242 Type1 steel. By adjusting the rolling process parameters such as furnace time, descaling passes, rough rolling outlet temperature, hot coil box mode, etc., the solution to ASTM A242 Type1 steel surface scale is studied.

By increasing the outlet temperature of rough rolling of ASTM A242 Type1 steel, the red rust-like scale disappears; controlling the outlet temperature of rough rolling, shortening the furnace time, increasing the number of descaling passes, and adopting straight-through mode rolling are beneficial to the improvement of willow-like scale, the excision rate of willow-shaped iron oxide scale decreased from 3.48% to 0.2%.