Stainless steel round steel introduction

Stainless steel bars are hot rolled or forged from stainless steel ingots.

The production of stainless steel bars emerged with the development of stainless steel. Due to the increasingly wide range of applications of stainless steel bars, such as the foundation of high-rise buildings in cold areas, isolation nets beside highways, household items, etc., the hot-rolled production of stainless steel bars has been greatly developed. 30% of stainless steel products in my country %, foreign countries only account for 8%-10%. With the rapid development of cutting-edge technologies such as petroleum, chemical industry, energy and atomic energy, aerospace, and marine development, higher comprehensive performance requirements have been put forward for stainless steel, which not only requires good corrosion resistance, but also requires high strength, high temperature and high pressure resistance. , radiation resistance, low temperature resistance and other properties, so that the types of stainless steel have been further developed.

Production process and classification

Stainless steel bars are hot rolled or forged from stainless steel ingots.

According to the shape, it can be roughly divided into: stainless steel round bar, stainless steel square bar, stainless steel hexagonal bar.

According to the surface treatment, it can be divided into: stainless steel black rod, stainless steel acid white rod, stainless steel bright rod, stainless steel grinding rod.

Stainless Steel Square Bar

Stainless steel square bar is a steel material with good corrosion resistance, heat resistance, low temperature strength and mechanical properties.

Specification and material of stainless steel square bar

Material: 304, 304L, 321, 316, 316L, 310S, 630, 1Cr13, 2Cr13, 3Cr13, 1Cr17Ni2, dual-phase steel, antibacterial steel and other materials!

Stainless steel hexagonal bar is a long, solid stainless steel material with a hexagonal cross section.

Hexagonal bar is a long, solid stainless steel material with hexagonal cross section. Due to the characteristics of stainless steel hexagonal bar, it is widely used in marine, chemical, construction and other fields.

Stainless steel round rod

Stainless steel round steel belongs to the category of long products and bars. The so-called stainless steel round steel refers to long products with a uniform circular cross-section, generally about four meters long. It can be divided into light circles and black rods. The so-called smooth round refers to a smooth surface that has been processed by quasi-rolling; while the so-called black rod refers to a black and rough surface that has been directly hot-rolled. Common materials are 301, 304, 303, 316, 316L, 304L, 321, 2520, 201, 202, etc. Specifications are expressed in diameter, such as "50", which means round steel with a diameter of 50 mm. Round steel is divided into three types: hot rolled, forged and cold drawn. The specifications of hot-rolled round steel are 5.5-250 mm.

Introduction to different series

2 series

202 stainless steel bar: belongs to chromium-nickel-manganese austenitic stainless steel, and its performance is better than 201 stainless steel.

201 stainless steel bar: belongs to chromium-nickel-manganese austenitic stainless steel with low magnetic properties.

3 series

316L stainless steel bar: 316 stainless steel contains molybdenum and low carbon content, and its resistance to pitting corrosion in marine and chemical industrial environments is much better than 304 stainless steel! (316L low carbon, 316N nitrogen high strength and high strength, 316F stainless steel with high sulfur content, easy to cut stainless steel.

304L stainless steel bar: As a low-carbon 304 steel, in general, the corrosion resistance is similar to 304, but after welding or after stress relief, its resistance to grain boundary corrosion is excellent, and it can also be used without heat treatment. Maintain good corrosion resistance.

304 stainless steel bar: has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, and no heat treatment hardening. Uses: tableware, cabinets, boilers, auto parts, medical appliances, building materials, food industry (use temperature -196°C-700°C).

310 stainless steel bar: The main features are: high temperature resistance, generally used in boilers, automobile exhaust pipes. Other properties are general.

303 stainless steel bar: It is easier to cut than 304 by adding a small amount of sulfur and phosphorus, and other properties are similar to 304.

302 stainless steel bar: 302 stainless steel bar is widely used in auto parts, aviation, aerospace hardware tools, chemical industry. Specifically as follows: handicrafts, bearings, slippery, medical equipment, electrical appliances, etc. Features: 302 stainless steel ball belongs to austenitic steel, which is close to 304, but the hardness of 302 is higher, HRC≤28, and has good rust and corrosion resistance.

301 stainless steel bar: good ductility, used for forming products. It can also be hardened by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel.

302 stainless steel ball belongs to austenitic steel, which is close to 304, but the hardness of 302 is higher, HRC≤28, and has good rust and corrosion resistance.

4 series

408—Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.

409 - The cheapest model (British and American), usually used as a car exhaust pipe, is a ferritic stainless steel (chromium steel).

410 stainless steel bar: belongs to martensitic (high-strength chromium steel), with good wear resistance and poor corrosion resistance.

416 - The addition of sulfur improves the processing properties of the material.

420 stainless steel bar: "cutting grade" martensitic steel, the earliest stainless steel similar to Brinell high chromium steel. Also used in surgical knives, can do very bright.

430 stainless steel bar: ferritic stainless steel, used for decoration, such as for car accessories. Good formability, but poor temperature and corrosion resistance.

440—High-strength cutting tool steel with slightly higher carbon content, high yield strength can be obtained after proper heat treatment, and hardness can reach 58HRC, which is one of the hardest stainless steels. The most common application example is "razor blades". There are three commonly used models: 440A, 440B, 440C, and 440F (easy processing type).

use

Mainly used for aircraft engine blades, casings, fasteners, combustion chambers, discs, shafts, combustion chamber walls, liquid oxygen kerosene engines, bomb bodies, gas cylinders, propulsion devices, etc. Widely used in aerospace, aviation, atomic energy, nuclear energy, petroleum, chemical industry, and food, environmental protection, marine development, boiler heat exchangers and other fields.