347 ステンレス鋼

What is stainless steel 347?

ステンレス鋼 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. Additionally, 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.
タイプ 347 is known for being workable under all common welding techniques, along with hot and cold working. しかし, 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 ステンレス鋼 1.4550 Finished Products Form

• Round, Sqaure, Hexagon & Flat Bars
• シームレス / Welded Pipes
• シームレス / Welded Tubes
• Hot & Cold Rolled Plates & Sheets
• Forged Bars
• Buttweld Pipe Fittings
• Forged Fittings
• Ferrule Compression Fittings
• Forged Flanges
• Valves
• Guages

Applications for 347 ステンレス鋼

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

Equivalents of grade 347

欧州連合 で	USA –	France AFNOR	England BS	Sweden SS	Russia ゴスト
X6CrNiNb18-10	347	Z6CNNb18-10	347S31	2338	08KH18N12B

構成 ranges for 347 grade of stainless steel

学年		で	ん	P	C	S	そして	Cr	OTHER	N
347	分.	9.00	–	–	–	–	–	17.0	Nb=10(C+N)	–
	最大.	13.00	2.00	0.045	0.08	0.030	1.00	20.0	1.0

機械的性質 

学年	抗張力 (MPa) 分	伸長 (% in 50mm) 分	降伏強さ 0.2% Proof (MPa) 分	硬度
				Rockwell B (HR B) 最大	Brinell (HB) 最大
347	515	40	205	92	201

物理的特性

学年	密度 (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			熱伝導率 (W/m.K)		Specific Heat 0-1000C (J/kg.K)	電気抵抗率 (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

Corrosion Resistance

• 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, 等.
• Steel resistant to stress corrosion in solutions of chlorides and hydroxides
• Steel resistant to pitting and contact corrosion in environments containing halides

熱処理

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

Key Benefits of Stainless Steel 347

ステンレス鋼 347 offers numerous advantages for various applications. One of its main benefits is its resistance to corrosion, which is due to its columbium stabilization. This property is crucial in harsh environments.

Its ability to resist high temperatures makes it ideal for extreme temperature applications. The material retains its mechanical integrity up to 1500°F (816℃).

Another significant advantage is its excellent welding properties. ステンレス鋼 347 does not suffer from carbide precipitation during welding processes, enhancing its durability.

Key Benefits:

• High-temperature stability
• 耐食性
• Excellent welding and fabrication properties

Why Choose 347 ステンレス鋼?

There are many reasons to select 347 Stainless Steel for industrial applications. Its columbium-stabilized composition ensures remarkable durability and resistance.

This material stands out for its ability to withstand high temperatures and oxidative conditions. Its adaptability makes it a popular choice among engineers.

Notable Advantages:

• Great high-temperature resistance
• Excellent corrosion protection
• Superb welding properties

These qualities make 347 Stainless Steel an ideal option for demanding environments and diverse applications.