Knife steel 30x13 strip circle, Dnipropetrovsk region.

A stainless steel circle (also known as a "round bar" or a "round bar", or a "block" if the diameter of the circle is large) is used in most cases as a blank used for the production of machine-building parts.
Main characteristics.
1. Resistant to corrosion;
2. High-strength;
3. Plastic;
4. Resistant to high temperatures;
5. It easily lends itself to processing and various variations of the quarrel;
6. The surface can be light or dark;
To obtain high strength of the material, heat treatment is used: natural/artificial aging, quenching, hot annealing.(//tractor-service.com)
There are different types of round bar manufacturing accuracy: normal, high, and high. This is influenced by the roundness of the cross section of the product.
There are two types:
1. Stainless hot-rolled circles:
This type is used in all spheres of industry.
2. Calibrated stainless circles:
Calibrated round bar, in turn, is either cold-rolled or cold-drawn. They have a light color. Additional surface treatment is also possible if necessary.
Stainless circle AISI 430, AISI 420, according to Gost 12Х17, 20Х13, 30Х13, 40Х13 is used where an alloy with a high index of wear resistance in mildly aggressive environments is needed. In everyday life it is found in the form of knives, scissors, tongs for removing cuticles, in industry - valves, blades of steam turbines, bolts, etc.

"