Type 347 stainless steel has slightly improved corrosion resistance over type 321 stainless steel in strongly oxidizing environments. Type 347 is stabilized with columbium, it is preferable for aqueous and low temperature environments due to its good resistance to intergranular attack. Both 347 and 321 offer good resistance to polythionic acid stress corrosion cracking, encountered in oil refineries. The high temperature oxidation resistance of 347 is similar to that of 304 stainless steel. Useful to 1500°F.
Often in many product forms, the grain size and carbon content can meet both the 347S and 347H requirements. Appropriate weld fillers are AWS ER347 bare wire and E347 covered electrodes.

Chemistry

Specifications

AMS 5512, AMS 5646, AMS 5680
ASME SA 240
ASTM A 269, ASTM A 479
ASTM A262 Practice E
MSRR 5632
PWA 300, PWA F17 LCS
UNS S34700, UNS S34709
W. Nr./EN 1.4550

Inventory

347 Coil, 347 Plate, 347 Round Bar, 347 Sheet, 347 Weld Wire

Common Trade Names

347H, 347 Stainless

Features

· Good creep strength up to 1500°F

· Maintains good corrosion resistance in applications where the temperature is between 800°F and 1500°F.

· Good resistance to intergranular corrosion in the as welded condition.

Applications

· Oil Refineries

· Fluid catalytic cracking units (FCC)

· Hanger rods

· Recuperator tube sheets, shell, supports

· Especially where temperatures exceed 550°F and resistance to sulfidation is needed

· Fired heater tubes

· Distributor trays and thermowells

· Equipment in and around reactors (good resistance to polythionic acid)

Physical Properties

Density: 0.286 lb/inch3
Melting Point: 2550 - 2635°F

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 240
Typical Tensile and Impact Properties

We can provide 347 material in the form of flange, fittings, pipes, fasteners.

Huitong Group was established in 1978. After 38 years'development and innovation,by now,Huitong Group has set up multiple subsidiary companies.Among them,Zhengzhou Huitong Pipe Fitting Co.,Ltd.,with the indepent right of import and export, is mainly engaged in exporting steel pipe and pipe fittings for Huitong Group and assisting another subsidiary company of Huitong Group:Zhengzhou Huitong Machanical Equipment Co.,Ltd., in exporting machanical equipment.

Zhengzhou Huitong Pipeline Equipment Co.,Ltd.,with the strong support of Huitong Group,and years'development and innovation, are more and more professional in technical service and can manufacure products with all kinds of material,shape and size. Especially in elbows, tee, reducer, flange and pipe cap etc., we have gained more than 20 product patent, and hundreds of technology patent. Also,we have gradually taken an ireplacable role in High-pressure,high-temperature and anti-corrosion area. With the continuous construction of engery in China,such as petrol gas,electric power,etc.,our company has become the purchasing center of whole set fittings for such projects.In 2009,a foreign trade team established,is manily engaged in oil gas and electric power projects abroad.By now, our products have been exported to Canada,Malaysia,Parkistan,UAE, Eygpt,the Middle East countries, etc.. We have passed the qualification of ISO9001:2000 and API quality certification system. High-quality products and high-class service are well received by abroad customers in this industry. The unique diversified production line can offer you one-package serive, you can pruchase all complex products from us at one time. What's more, our sufficient material stock and conventional product stock can ensure you receive satisfied product in the shortest time.

With powerful financial strength,advanced managerial concept, excellent marketing service,strict quality control system and integrated marketing team,we would like to develop together with you hand in hand. Adhering to the operation principle of "faith first and clients foremost", we always supply high quality products, complete after-sales service and favorable prices. We sincerely hope to establish long-term cooperation with you on the basis of mutual benefits, reciprocity and common development.