347 不锈钢

What is stainless steel 347?

不锈钢 347 is similar to the 321 stainless steels in that it is often used as a stabilized alternative to Type 304. In the case of 347, however, the stabilizing agent is columbium. This metal intensifies 347’s already present ability to withstand intergranular corrosion for maximum capabilities. 此外, the columbium allows for 347 to undergo repeated heating in temperatures up to 1650° F. As a result, the metal is commonly applied to high temperature equipment, such as gaskets and expansion joints, along with rocket engine and chemical manufacturing.
In addition to its heat resistance properties, 347 also enjoys better resistance against creep and stress rupture corrosions. This is another advantage of type 304, as 347’s characteristics may be better suited for environments where stabilization is a primary concern.
类型 347 is known for being workable under all common welding techniques, along with hot and cold working. 然而, when being heat treated the metal must be heated up in the range of 2100 to 2250°F. This is due to 347’s inability to work harden under heat treatment. Cold reduction is the only method that will utilize the alloy’s elevated properties.

347 不锈钢 1.4550 Finished Products Form

• Round, Sqaure, Hexagon & Flat Bars
• 无缝的 / Welded Pipes
• 无缝的 / Welded Tubes
• 热的 & Cold Rolled Plates & Sheets
• Forged Bars
• Buttweld Pipe Fittings
• Forged Fittings
• Ferrule Compression Fittings
• Forged Flanges
• Valves
• Guages

Applications for 347 不锈钢

Collector rings, airplane exhaust stacks, annealing box covers, jet engine parts.expansion joints, tubing, fasteners, flexible metal hose and bellows

乙等值等级 347

欧洲联盟 在	美国 –	法国 AFNOR	England BS	瑞典 SS	Russia 国家标准
X6CrNiNb18-10	347	Z6CNNb18-10	347S31	2338	08KH18N12B

作品 范围为 347 不锈钢等级

年级		在	锰	磷	C	S	和	铬	OTHER	氮
347	分钟.	9.00	–	–	–	–	–	17.0	Nb=10(C+N)	–
	最大限度.	13.00	2.00	0.045	0.08	0.030	1.00	20.0	1.0

机械性能 

年级	抗拉强度 (兆帕) 分钟	伸长 (% in 50mm) 分钟	屈服强度 0.2% Proof (兆帕) 分钟	硬度
				Rockwell B (HR B) 最大限度	Brinell (HB) 最大限度
347	515	40	205	92	201

物理特性

年级	密度 (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			导热系数 (W/m.K)		Specific Heat 0-1000C (J/kg.K)	电阻率 (n.m)
			0-1000C	0-3150C	0-5380C	at 1000C	at 5000C
347	8000	193	17.2	17.8	18.4	16.2	21.5	500	720

耐腐蚀性能

• Pitting corrosion-resistant steel
• Steel resistant to rural and non-industrial urban atmosphere
• Stainless steel less aggressive sea atmosphere
• Steel resistant to salt of nitric acid and nitric acid at concentrations of up to 55% and temperatures up to 80 ℃
• Steel resistant to non-oxidizing environments, e.g. H2SO4, HCl, HF, ETC.
• Steel resistant to stress corrosion in solutions of chlorides and hydroxides
• Steel resistant to pitting and contact corrosion in environments containing halides

热处理

Annealing temperature range is 1800 to 2000°F

May be stress relief annealed within the carbide precipitation range of 800 to 1500°F without any danger of subsequent intergranualr corrosion

Cannot be hardened by heat treatment

WELDABILITY

Austenitic stainless steels are considered to be the most weldable out of all high alloy steels

Can be welded by all fusion and resistance welding processes