302HQ Stainless steel

什么是不锈钢 302HQ？

Grade 302HQ is a specialised wire grade with very wide usage for manufacture of stainless steel

紧固件. 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

紧固件. It has now totally replaced Grades 384 和 305 for cold heading applications, copper

being a lower cost alternative to their high nickel contents.

The designation 302HQ is not standardised – ASTM specifications list the grade as UNS S30430,

and alternative designations for the same grade include “XM-7”, “304铜” 和 “304HQ”. 这

standard specification for stainless steel fasteners, 国际标准化组织 3506, includes 302HQ as an acceptable

composition for fastener grade “A2”; it is commonly produced in strength grades A2-70 and A2-80.

302HQ 不锈钢 1.4567 成品表

• 线圈 – 条
• 挫败: Inquire with Ulbrich Stainless Steel Wire – Profile
• 圆形的
• 平坦的
• 正方形

申请 302HQ 不锈钢

• 食品加工设备
• Transport and storage equipment (e.g., beer brewing, milk processing, wine making)
• Kitchen benches, sinks, troughs, equipment, and appliances
• Architectural paneling, railings, and trim
• Chemical containers, including for transport
• 热交换器
• Woven or welded screens
• Threaded fasteners
• Springs

乙quivalents of grade 302HQ

年级	联合国编号	老英国人		欧洲标准		Swedish SS	Japanese JIS
		学士	在	不	姓名
302HQ	S30430	394S17	–	1.4567	X3CrNiCu18-9-4	–	SUS XM7

作品 ranges for 302HQ grade of stainless steel

机械性能 

财产	价值
抗拉强度, 分钟	515 兆帕
屈服强度 (0.2% 证明), 分钟	205 兆帕
Elongation in 50 毫米, 分钟	40%
硬度, 最大限度	201 HB

物理特性

年级	密度 (公斤/立方米)	弹性模量 (GPa)	平均热膨胀系数 (微米/米/°C)			导热系数 (瓦/米·K)		比热 0-100 ℃ (焦耳/公斤.K)	电阻率 (nΩ.m)
			0-100 ℃	0-315 ℃	0-538 ℃	在 100 ℃	在 500 ℃
302HQ	8027	193	17.2	17.8	18.8	16.3	21.5	500	720

耐腐蚀性能

Equal to or exceeding that of 年级 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.

耐热性

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.

热处理

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

Cold Work Hardening

302HQ has the lowest work hardening rate of any of the common austenitic stainless steels. This results in a tensile strength increase of approximately 8MPa/%Ra (8MPa increase in tensile strength for each 1% reduction of area of cold work – this data from wire drawing). Even after substantial cold work this grade remains essentially non-responsive to a magnet.

焊接

Stainless steel AISI 304CU (1.4567, X3CrNiCu18-9) has good weldability and can be used with many common welding processes such as TIG welding and MIG welding. It can also be used for arc welding, but this should be carried out with appropriate welding parameters to avoid overheating and distortion. To reduce tension and maintain the mechanical properties, the material should be allowed to cool in the air after welding. No heat treatment is required.

机械加工性

AISI 304CU (1.4567) stainless steel is generally machinable, but this material hardens during machining. 所以, care must be taken to select a sufficient cutting depth. 此外, suitable tools and coolants should be used to prevent overheating and extend tool life.