Mild Steel Cutting Machine

Mild steel categories: Carbon steel generally can be divided into 3 categories:

1. Low carbon steel (C: ≤ 0.25%), also referred to as mild steel, is readily susceptible to various processing methods such as forging, welding, and cutting. It is frequently employed in the manufacturing of chains, rivets, bolts, shafts, etc.

2. Medium carbon steel (C: 0.25% < C ≤ 0.6%) encompasses killed steel, semi-killed steel, boiling steel, and other products. Besides carbon, it may also contain a small quantity of manganese (0.70% - 1.20%). Based on product quality, it is classified into ordinary carbon structural steel and high-quality carbon structural steel. Its hot working and cutting performance is favorable, yet its welding performance is inadequate. The strength and hardness are higher than those of low carbon steel, while the toughness are lower than those of low carbon steel. Both hot-rolled and cold-drawn materials can be directly utilized without heat treatment, and can also be employed after heat treatment. Medium carbon steel subjected to quenching and tempering exhibits excellent comprehensive mechanical properties. The maximum achievable hardness is approximately HB538, and the tensile strength σb ranges from 600 to 1100 MPa. Hence, among the various applications at the medium strength level, medium carbon steel is the most extensively utilized. Besides serving as a construction material, it is also extensively employed in the manufacturing of various mechanical components.

3. High carbon steel (C: > 0.6%) is often dubbed tool steel, with a carbon content ranging from greater than 0.60% to 1.70%, and can undergo hardening and tempering. Hammers, crowbars, etc. are fabricated from steel with a carbon content of 0.75%; cutting tools such as drills, taps, reamers, etc. are manufactured from steel with a carbon content of 0.90% to 1.00%.

The higher the carbon content, the greater the hardness and strength. Between above carbon steel, Low carbon steel also referred to as mild steel is greatly suitable for flame cutting, example following our portable type MS-P:

Mild steel cutting machine of portable flame CNC cutting machine MS-P

Grades and using of mild steel:

When you buy mild steel, there may be no carbon contents etc display, but normally grade is marked on steel sheet:

1. Ordinary carbon structural steel: carbon structural steel is divided into 5 grades according to the yield strength of steel: Q195, Q215, Q235, Q255, Q275. Each grade is divided into A, B, C, D grades due to different quality, Q195, Q215, Q235 forming is good, can be rolled into steel plate, steel bar, steel pipe and so on; Q255, Q275 can be rolled into steel, steel plate, etc.

2.High-quality carbon structural steel: steel number to the average mass of carbon tens of thousands of points. Such as 20 #, 45 #, etc. 20 # means containing C: 0.20% (20 parts per 10,000). Usage: Mainly used for manufacturing various machine parts.

3. Carbon tool steel: Steel number is expressed by the average mass fraction of carbon, and is preceded by T. Such as T9, T12, etc. T9 means containing C: 0.9% (9 parts per thousand). Usage: Mainly used in manufacturing various cutting tools, measuring tools, molds and so on.

4. Cast steel: The cast steel grade is crowned with ZG in front of the number, and the number represents the average quality fraction in the steel (expressed in tens of thousands of points). For example, ZG25, the value contains 0.25% C. Uses: Mainly used in the manufacture of complex shapes and require a certain strength, forming and toughness of parts, such as gears, couplings, etc.

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