SUS301 vs SUS304: A Comprehensive Material Comparison

SUS301 vs SUS304

SUS304 (Stainless Steel):

It is the most commonly used type of stainless steel. It contains Nickel, hence, it has better corrosion resistance and heat resistance than Chromium steel. It also has low temperature strength, excellent mechanical properties, and significant work hardening.

It doesn’t harden through heat treatment and is non-magnetic. It has good strength, less elasticity, and is commonly used in thickness between 0.4T~1.0T. Therefore, it is widely used in Notebook brackets that require structural strength. The specific grade must be specified to meet design requirements.

Generally, 3/4H is suitable. If drawing is required, and it is used for LCD brackets, 1/2H is generally suitable. However, to save costs, some companies are substituting SUS430 for SUS304.

SUS301 (Stainless Steel):

Its Chromium content is lower than SUS304, so its corrosion resistance is inferior. However, it can achieve very high tensile strength and hardness through cold working. Its good elasticity makes it widely used in Notebooks for EMI protection and as flexible contact parts.

But it is commonly used in thickness between 0.04T~0.07T. The specific grade must be specified to meet design requirements (such as elasticity, strength).

Also, note that SUS301 material has metal crystalline directionality, the higher the grade, the harder and more brittle it is. If not handled carefully during forming, it can easily cause cracks at corners and side walls.

Material Properties:

SUS301: Suitable for elastic applications, has high carbon content, high hardness, less prone to elastic fatigue, poor ductility, and is not easy to draw.

SUS304: Not suitable for elastic applications, has low carbon content, low hardness (soft).

SUS 430: This material contains numerous impurities (not pure), leading to unstable hardness.

Notes:

1. If the hardness of the two is close, such as (SUS 301 3/4H and SUS 304H), even though the hardness is the same, SUS 304H is more likely to produce elastic fatigue when used in elastic products.

2. Material thickness affects hardness tolerance (the thicker the material, the greater the tolerance).

SUS301

SUS301 Chemical Composition

GradeChemical composition(WT%)
CMnNiSiPSNbCr
SUS301≤0.15≤2.006.00-8.00≤1.00≤0.035≤0.030/16.00-18.00

Heat Treatment Specification: Solution treatment at 1010-1150°C, rapid cooling.

Metallographic Structure: The structural characteristic is austenitic.

Delivery Condition: Generally delivered in heat-treated condition, the type of heat treatment is specified in the contract; if not specified, it is delivered in the non-heat-treated condition.

Mechanical Properties of SUS301

GradeMechanical and Physical Properties
Tensile Strengthδ b(MPa)Yield Strengthδs(MPa)Elongation Rateδ5(%)Cross-sectional Shrinkage Rate(%)Impact Energy Akv(J)Impact Toughness Value α kv(J/cm2HardnessSample Blank Size
SUS301≥520≥205≥40≥60////

Hardness:≤187HB; ≤90HR;≤200HVK

GradeStandard Mechanical Performance in Different States
Status MarkerVickers Hardness HVYield Strength(YS)Tensile Strength(TS)Elongation Rate(EL)
SUS304ANN200max205min520min40min
SUS3041/2H250min470min780min6min
SUS3043/4H310min665min930min3min
SUS304FH370min880min1130min 
SUS301ANN200max205min520min40min
SUS3011/2H310min510min930min40min
SUS3013/4H310min745min1130minSmin
SUS301FH430min1030min1320min3min
SUS301EH490min1275min1570min 

SUS301 Density

7.93g/cm3

Hardness of SUS301

Material   Hardness Symbol   Hardness Value
SUS3011/4H250 and above
SUS3011/2H300 to 310 and above
SUS3013/4H360 to 370 and above
SUS301H400 to 430 and above
SUS301EHAbove 490

SUS304

SUS is a general term for Japanese steel grades.

SUS304 is a Japanese JIS standard stainless steel, corresponding to China’s 0Cr18Ni9, and America’s 304.

Characteristics: It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good thermal processing such as stamping and bending, no heat treatment hardening phenomenon, and is non-magnetic.

Applications: Household items, kitchen cabinets, indoor pipelines, water heaters, boilers, bathtubs, auto parts, medical equipment, building materials, chemicals, food industry, agriculture, ship parts.

SUS304 Properties

SUS304 Stainless Steel Properties

GradeMechanical and Physical Properties
Tensile Strengthδ b(MPa)Yield Strengthδs(MPa)Elongation Rateδ5(%)Cross-sectional Shrinkage Rate(%)Impact Energy Akv(J)Impact Toughness Value α kv(J/cm2)HardnessSample Blank Size
SUS301≥520≥205≥40≥60////

Hardness:≤187HB; ≤90HR;≤200HVK

SUS304 Density

7.85g/cm-3

SUS304 Composition

SUS304 Stainless Steel Composition

GradeChemical composition(WT%)
CMnNiSiPSNbCr
SUS304≤0.07≤2.008.00~11.00≤1.00≤0.035≤0.030/7.00~19.00
SUS301≤0.15≤2.006.00~8.00≤1.00≤0.035≤0.030/6.00~18.00

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