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Corrosion Resistance Stainless Steel Wire Grade 302HQ 304HC 0.05mm ~ 10mm ASTM A493

Corrosion Resistance Stainless Steel Wire Grade 302HQ 304HC 0.05mm ~ 10mm ASTM A493
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Product: Stainless Steel Wire
Standard: GB , JIS, ASTM , AISI , DIN
Grade: 302HQ
Surface: Surface Is Uniform And Beautiful, With Linear Stability.
C: Max 0.03%
Cr: 17%-19%
Ni: 8%-10%
Sectional Dimension: 0.05mm-10mm
High Light:

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Basic Infomation
Place of Origin: CHINA
Brand Name: HAOSTEEL
Certification: ISO9001
Model Number: HS302
Payment & Shipping Terms
Packaging Details: Woven bags and plastic strips inside packing, wooden / iron pallet and steel strips outside packing.
Delivery Time: 5-10 working days after order confirmed and receive deposit
Payment Terms: L/C, T/T
Supply Ability: 5000tons per month
Product Description

302HQ 304HC 0.05mm ~ 10mm stainless steel wire high tensile strength



302HQ is a specialised wire grade with very wide usage for manufacture of stainless steel fasteners. The inclusion of 3% copper in the composition reduces the cold work hardening rate substantially compared to Grade 304. 302HQ is standard for manufacture of self-tapping screws and light machine screws; it is also used for some bolts, set screws, rivets and specialised fasteners. It has now totally replaced Grades 384 and 305 for cold heading applications, copper being a lower cost alternative to their high nickel contents.
The stable austenitic structure makes 302HQ non-magnetic, even after substantial cold work, and also results in excellent toughness, even down to cryogenic temperatures.


Chemical composition:

Grade C Mn Si P S Cr Mo Ni Cu
302HQ min. max.



















Physical Properties (typical values in the annealed condition)

Grade Density (kg/m3)

Elastic Modulus


Mean Coefficient of

Thermal Expansion

Thermal Conductivity

Specific Heat


( J/kg.K)

Electrical Resistivity








at 100°C (W/m.K) at 500°C (W/m.K)
302HQ 7900 193 17.2 17.8 18.8 16.3 21.5 500 720


Grade Specification Comparison




Euronorm Swedish SS Japanese JIS
No Name
302HQ S30430 1.4567 X3CrNiCu18-9-4 - SUS XM7


Corrosion Resistance
Equal to or exceeding that of Grade 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 50°C. 302HQ is considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C. Consult hao Technical Assistance for specific environmental recommendations.


Heat Resistance
Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C. Continuous use of Grade 302HQ in 425- 860°C range is usually safe (free of carbide precipitation) as the grade has a very low carbon content.


Heat Treatment
Solution Treatment (Annealing) Heat to 1010-1120°C and cool rapidly. This grade cannot be hardened by thermal treatment.


Use Grade 308L rods or electrodes. Excellent weldability by all standard fusion methods, both with and without filler metals. Because of its applications this grade is not often welded. Exceptions are resistance butt welding to join wires together during wire manufacture, and when the grade is used to make stud welding fasteners. 302HQ is not specifically listed in AS 1554.6.


302HQ is rarely machined, because of its form and likely products. The grade always has very low sulphur content as this aids formability, but unfortunately this also reduces machinability. Machining is certainly possible.
An Improved Machinability version of Grade 302HQ is produced, having a very high machinability. This version has a slightly higher sulphur content and is also calcium treated. This Improved Machinability grade (referred to as Ugima 4567) is available only to special order, but should be considered as an option where an “18/8” type grade needs to be both heavily cold formed and extensively machined.


Specified Properties

These properties are specified for grade S30430 wire in ASTM A493; wire is the only commonly available form for this grade. Properties of finished fasteners are covered by other specifications, such as ISO 3506-1 and 3506-3.

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