Steel pipe

Increase or decrease propensity to hardening during heat treatment
Examples-Austenitic Manganese steel, Stainless Steel, Tool Steel, Die Steel etc.

Improved mechanical strength and toughness

High alloy Steel: Contains alloying elements more than 10%

Low alloy steel: Contains alloying elements, less than 10%

Alloy Steel

Used in service where high hardness desired
Examples-Dies, Springs, Cutting tools etc
 

Have poor weldability

Have very high strength

Can be heat treated & hardened

Contain more than 0.6% carbon & less than 2%

High Carbon Steel

Tendency to crack more with Hydrogen embrittlement if carbon equivalent more than 0.55%
Example -Machine parts, Structures, Gears, Cast Steel components etc.

Have tendency to crack in the HAZ

Have higher hardness than low carbon steels

Have much good strength

Carbon content varies from 0.3% to 0.6%

Medium Carbon Steel

Low strength
Examples-Frames, Angles, Channels, Pipes etc.

Have very good ductility and weldability.

Contain up to 0.3% carbons

Low Carbon Steel

Type of Steel

Low Carbon Steel
Contain up to 0.3% carbons
Have very good ductility and weldability.
Low strength