347SS Description

347 stainless steel tube: 18% chromium, 11% nickel

347 contains tantalum and niobium. It is mainly used in welding parts at high temperature

347 stainless steel tube =0Cr18Ni11Nb containing Nb to improve intergranular corrosion resistance, with strength improvement, plasticity does not reduce. Reduce the thickness of the material. As a structural strength component.

347 stainless steel tube heat treatment: solution treatment (C) 980-1150 quick cooling

Mechanical Properties of Solution treated Austenitic Steel for 347 Stainless steel Tubes (GB/T4237-92)

Yield strength ≥205/MPa, tensile strength ≥520/ MPa, elongation ≥35%, hardness test: HBS≤187, HRB≤90, HV≤200

347 stainless steel tube chemical composition: C 0.08 or less, Si 1.00 or less, Mn 2.00 or less, P acuities were 0.035, S 0.030 or less, Ni = 9 ~ 13, Cr = 17.00 ~ 19.00, Nb 5 * C % or more

Type 347 / 347H stainless steel is an austenitic grade of chromium steel, which contains columbium as a stabilizing element. Tantalum can also be added for achieving stabilization. This eliminates the carbide precipitation, as well as intergranular corrosion in steel Bars.

Type 347 / 347H stainless steel Bars offer higher creep and stress rupture properties than grade 304 and 304L. This makes them suitable for exposures to sensitization and intergranular corrosion.

Moreover, the inclusion of columbium allows 347 Bars to have excellent corrosion resistance, even superior to that of 321 stainless steel bars. However, 347H steel is the higher carbon composition substitute of stainless steel bar grade 347. Therefore, 347H steel bars offer improved high temperature and creep properties.

With wide experience and expertise, Lion Metal Group is one of the leading 347/347h stainless steel bar/rod manufacturers and suppliers. We have hundreds of high-qualified workers at your service. Please rest assured to get the competitive price 347/347h stainless steel bar/rod for sale with us.

Our range of SS 347 Bar is extremely economical, and thus making our products highly valuable among our clients. Most sizes of SS 347 Bars can be cut to exact sizes. Non standard sizes of SS 347 Bars can be made to order.

SS 347H Bars are available in diverse sizes, grades and shapes, and are quality passed and tested as per international standards. LION Bars as well fabricate and design these SS 347H Bars in different specifications and designs as per requirements of our customers.


SS 347S347001.4550
SS 347HS347091.4961/1.4912

Chemical Properties:

3470.08 maxmin: 17.0
max: 20.0
2.0 maxmin: 9.0
max: 13.0
0.04 max0.30
min:10x C
max: 1.0
347Hmin: 0.04
max: 0.10
min: 17.0
max: 20.0
2.0 maxmin: 9.0
max: 13.0
0.03 max0.30
min:10x C
max: 1.0

Mechanical Properties:

GradeTensile Strength ksi (MPa) minYield Strength 0.2% ksi offset ksi (MPa) minElongation (% in 50mm) minHardness (Brinell) MAXHardness (Rockwell B) MAX

Physical Properties:

Coefficient of
Thermal Expansion (min/in)-°F
Thermal Conductivity BTU/hr-ft-°FSpecific Heat BTU/lbm -°FModules of Elasticity (annealed)2-psi
at 68 °Fat 68 – 212°Fat 68 – 1832°F68-932°Fat 32 – 212°Fin tension (E)
0.2889.211.414.70.1228 x 106

Corrosion Resistance:

1、Offers similar resistance to general, overall corrosion as Alloy 304

2、Used for applications where alloys such as Alloy 304 are vulnerable to intergranualr corrosion

3、Generally used for heavy welded equipment which cannot be annealed and for equipment which is operated between 800 to 150°F (427 TO 816°C)

4、Alloy 347 is preferred over Alloy 321 for aqueous and other low temperature environments

5、Primarily used in high temperature environments where resistance to sensitization is necessary, in turn preventing intergranualr corrosion at lower levels

6、Susceptible to stress corrosion cracking

7、Exhibits oxidation resistance similar to all other 18-8 austenitic stainless steels


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

2、Can be welded by all fusion and resistance welding processes

Heat Treatment

1、Annealing temperature range is 1800 to 2000°F

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

3、Cannot be hardened by heat treatment