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Something You Need To Know About Stainless Steel

In daily life, we often see products made of stainless steel, so what is stainless steel? What’s inside the stainless steel? This article will introduce in detail the characteristics, type, grades, chemical composition, property and application, material specifications and other information about stainless steel.

Stainless steel, also known as stainless acid-resistant steel, is a ferroalloy material with excellent rust resistance, corrosion resistance and formability. It has a variety of surface treatments, and in the production process, it has good heat treatment performance, good processing performance, high efficiency, and has the best fire resistance among all metal materials. And stainless steel is widely used in the fields of electrical appliances, daily necessities and heavy industry.

Stainless Steel Characteristics

1.Excellent corrosion resistance and rust resistance in various corrosive media
2.The surface is smooth, bright, bright and beautiful, easy to clean
3.Good wear resistance, heat resistance, oxidation resistance and welding performance
4.Easy plastic processing, good polishing
5.Anti-fatigue, high strength, high toughness
6.Good durability and long service life
7.High temperature and low temperature resistance
8.Excellent thermal expansion performance and thermal insulation performance

Stainless Steel Type

According to the crystal structure of stainless steel, it can be divided into five types:
(1) Austenitic stainless steel
Included models are: AISI 201, 202, 301, 301L, 304, 309s, 310s, 316L and other models.

(2) Martensitic stainless steel
The models included are: AISI 410, 414, 416, 416(Se), 420, 431, 440A, 440B and other models.

(3) Ferritic stainless steel
Included models are: AISI 409, 430, 430Ti, 433, 434, 436, 439, 441 and other models.

(4) Austenitic-ferritic duplex stainless steel
The models included are: AISI 255, 329, 2205, S31500, S31803, S31200 and other models.

(5) Precipitation hardened stainless steel
The models included are: 630, 0Cr17Ni4Cu4Nb, 0Cr17Ni7Al, 0Cr15Ni25Ti2MoVB and other models.

Stainless Steel Grades

GBASTM / UNSDIN EN/DINJIS
12Cr17Mn6Ni5N201 / S20100X12CrMnNi 17-7-5SUS 201
12Cr18Mn9Ni5N202 / S20200X12CrMnNi 18-9-5SUS 202
12Cr17Ni7301 / S30100X10CrNi 18-8 / 1.4310SUS 301
S30153301LN / S30153X2CrNiN18-7 / 1.4318SUS 301L
Y12Cr18Ni9303 / S30300X8CrNiS 18-9 / 1.4305SUS 303
06Cr19Ni9304 / S30400X5CrNi 18-10 / 1.4301SUS 304
022Cr19Ni10N304LN / S30453X2CrNiN 18-10 / 1.4311SUS 304LN
022Cr19Ni10304L / S30403X2CrNi 19-11 / 1.4306SUS 304L
16Cr25Ni20Si2S31400X15CrNiSi 25-20 / 1.4841-
06Cr17Ni12Mo2316 / S31600X5CrNiMo 17-12-2 / 1.4401SUS 316
022Cr17Ni12Mo2316L / S31603X2CrNiMo 18-14-3 / 1.4435SUS 316L
12Cr13410 / S41000X10Cr 13 / 1.4006SUS 410
68Cr17440A / S44002-SUS 440A
SUS 440A630 / S17400-SUS 630

Stainless Steel Chemical Composition

GradeChemical Composition(%)
ASTM / UNSCSiMnPSCrNiMoCuVOther
201 / S20100≤0.15≤1.005.5 - 7.5≤1.005.5 - 7.55.5 - 7.55.5 - 7.55.5 - 7.55.5 - 7.55.5 - 7.55.5 - 7.5
316 / S31600≤0.08≤1.00≤2.00≤0.045≤0.03016.00-18.0010.0-14.02.00-3.00---
410 / S41000≤0.15≤1.00≤1.00≤0.040≤0.02811.50-13.503.000.60---
440A / S440020.60-0.75≤1.00≤1.00≤0.040≤0.02816.0-18.0-≤0.75---
630 / S17400≤0.70≤1.00≤1.00≤0.035≤0.02815.5-17.53.00-5.00-3.00-5.00-Nb:0.15-0.45

AISI 304 Stainless Steel
304 steel is one of the most commonly used materials in the manufacture of daily necessities, and is a common material in stainless steel. 304 stainless steel contains more than 18% chromium and more than 8% nickel. It cannot be hardened by heat treatment, but it can be work hardened. It has the characteristics of good processability, corrosion resistance and high toughness. Widely used in industry, food, construction, furniture decoration, medical and chemical industries.

AISI 316 Stainless Steel
AISI 316 stainless steel is the second most widely used steel grade. Due to the addition of Mo element, its corrosion resistance and high temperature strength are greatly improved, and it is non-magnetic. Mainly used in production equipment, surgical equipment, ropes, bolts, nuts, valve bodies, etc.

AISI 410 Stainless Steel
It contains 0.15% carbon and 13% chromium, and is a martensitic stainless steel. AISI 410 Stainless Steel has the characteristics of excellent machinability, high strength, corrosion resistance and good processing performance. It is primarily used in the manufacture of knives, food processing equipment, mechanical components, valves, bearings, pressure vessels, aerospace parts, automotive exhaust systems, and more.

Stainless Steel Bar (round bar, hexagonal bar, square bar, oval bar): diameter 2mm-480mm;

Stainless Steel Plate:
General stainless steel plate specifications and sizes: 1000×2000 mm, 1219×2438 mm, 1500×6000 mm, 1800×6000 mm.

Different types of stainless steel have different specification ranges, and other specifications can be customized;

Stainless steel has many excellent properties and is widely used in many industries, and there are more and more stainless steel manufacturing companies, so it is necessary to learn more about stainless steel and better choose the stainless steel that suits your project.

Songshun Steel, as a professional stainless steel supplier in China, supplies various types of stainless steel and ensures to provide you with the best quality stainless steel products.

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