hot rolled a36 steel plate for ship building

Hot rolled steel plate a36 

ASTM A-36 HOT ROLLED PLATE

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Machining
Welding
Heat Treatment
Applications

Introduction

ASTM A36 is the most commonly used mild and hot-rolled steel. It has excellent welding properties and is suitable for grinding, punching, tapping, drilling and machining processes. Yield strength of ASTM A36 is less than that of cold roll C1018, thus enabling ASTM A36 to bend more readily than C1018. Normally, larger diameters in ASTM A36 are not produced since C1018 hot roll rounds are used.

ASTM A36 is usually available in the following forms:

• Rectangle bar
• Square bar
• Circular rod
• Steel shapes such as channels, angles, H-beams and I-beams.

Chemical Composition

Physical Properties

Mechanical Properties

Machining

The machinability rate of ASTM A36 is estimated to be 72%, and the average surface cutting feed of ASTM A36 is 120 ft/min. Machining of ASTM A36 steel is not as easy as that of AISI 1018 steel.

Welding

ASTM A36 steel is easy to weld using any type of welding methods, and the welds and joints so formed are of excellent quality.

Heat Treatment

Any standard carburizing and hardening methods of AISI 1018 steel is suitable for ASTM A36.

ASTM A36 is subjected to the following processes:

• Normalizing at 899°C – 954°C (1650°F-1750°F)
• Annealing at 843°C – 871°C(1550°F-1600°F)
• Stress relieving at 677°C – 927°C(1250°F-1700°F)
• Carburizing at 899°C – 927°C (1650°F-1700°F)
• Hardening at 788°C – 816°C(1450°F-1500°F)

Applications

ASTM A36 steel has the following applications:

• It is used in bolted, riveted or welded construction of bridges, buildings and oil rigs.
• It is used in forming tanks, bins, bearing plates, fixtures, rings, templates, jigs, sprockets, cams, gears, base plates, forgings, ornamental works, stakes, brackets, automotive and agricultural equipment, frames, machinery parts.
• It is used for various parts obtained by flame cutting such as in parking garages, walkways, boat landing ramps and trenches.

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