ASTM A276 AISI 347 Stainless Steel Round Bar Manufacturer, Supplier and Stockist in India

Steel House India is a manufacturer, supplier, and stockist of ASTM A276 AISI 347 Stainless Steel Round Bars for power generation facilities, petrochemical processing plants, refinery infrastructure, aerospace engineering applications, thermal processing systems, and high-temperature industrial equipment. Manufactured in accordance with ASTM A276 specifications, these round bars are widely used in applications requiring elevated-temperature strength, oxidation resistance, fabrication reliability, and long-term corrosion performance.

ASTM A276 UNS S34700 Stainless Steel Round Bars are columbium (niobium) stabilized austenitic stainless steel bars developed to resist chromium carbide precipitation during prolonged exposure to elevated temperatures. This stabilization improves resistance to intergranular corrosion and allows the material to perform effectively in environments involving thermal cycling, welding operations, and continuous high-temperature service.

Benefits of ASTM A276 AISI 347 Stainless Steel Round Bars

ASTM A276 AISI 347 Stainless Steel Round Bars offer excellent resistance to oxidation, superior high-temperature stability, good weldability, and enhanced protection against intergranular corrosion. The niobium stabilization mechanism improves performance in elevated-temperature environments where conventional austenitic stainless steels may experience sensitization after prolonged thermal exposure. These characteristics make UNS S34700 round bars suitable for critical industrial equipment requiring long service life, dimensional stability, and reliable mechanical performance.

Why UNS S34700 is Preferred for High Temperature Applications

UNS S34700 is specifically designed for applications operating under elevated temperatures where corrosion resistance and thermal stability must be maintained simultaneously. The addition of niobium stabilizes the material by preventing chromium carbide precipitation, helping preserve corrosion resistance during welding and long-term heat exposure. This makes ASTM A276 AISI 347 Stainless Steel Round Bars a preferred choice for refinery heaters, thermal processing equipment, aerospace systems, pressure-retaining components, and industrial furnace assemblies where sustained high-temperature performance is essential.

Chemical Composition of ASTM A276 UNS S34700 Stainless Steel Round Bars

The balanced chemical composition of ASTM A276 UNS S34700 Stainless Steel Round Bars provides the corrosion resistance, oxidation resistance, and thermal stability required for demanding industrial environments. Chromium contributes to corrosion protection, nickel improves toughness and structural stability, while niobium acts as the primary stabilizing element responsible for high-temperature performance.

Chemical Composition of ASTM A276 AISI 347 Round Bars

Product Condition	Carbon C %	Manganese Mn %	Silicon Si %	Phosphorus P %	Sulfur S %	Chromium Cr %	Nickel Ni %	Niobium + Tantalum %	Iron Fe
ASTM A276 SS347	0.08 Max	2.00 Max	1.00 Max	0.045 Max	0.030 Max	17.00–19.00	9.00–13.00	10 x C Min	Balance
UNS S34700	0.08 Max	2.00 Max	1.00 Max	0.045 Max	0.030 Max	17.00–19.00	9.00–13.00	10 x C Min	Balance
Bright Drawn	0.045	1.50	0.45	0.030	0.015	18.00	10.50	0.65	Balance
Cold Drawn	0.050	1.55	0.50	0.032	0.018	17.80	10.20	0.62	Balance
Hot Rolled	0.060	1.70	0.60	0.040	0.020	17.50	10.00	0.60	Balance
Forged	0.058	1.75	0.65	0.040	0.020	17.60	10.10	0.61	Balance
Peeled	0.050	1.60	0.50	0.032	0.015	17.90	10.30	0.63	Balance
Ground Finish	0.045	1.50	0.45	0.030	0.015	18.10	10.50	0.66	Balance

Mechanical Properties of ASTM A276 AISI 347 Stainless Steel Round Bars

ASTM A276 AISI 347 Stainless Steel Round Bars provide a combination of strength, ductility, toughness, and elevated-temperature stability required in critical engineering applications. The material maintains useful mechanical properties during thermal cycling and prolonged high-temperature service, making it suitable for demanding industrial environments.

Mechanical Properties of Stainless Steel 347 Round Bars

Product Condition	Tensile Strength MPa	Yield Strength MPa	Elongation %	Hardness HB	Hardness HRB	Density g/cm³	Elastic Modulus GPa
Annealed	515	205	40	201	92	7.96	193
Bright Drawn	720	440	34	245	100	7.96	193
Cold Drawn	700	420	35	240	99	7.96	193
Hot Rolled	620	260	38	225	96	7.96	193
Forged	650	280	36	230	97	7.96	193
Peeled	690	410	35	238	99	7.96	193
Ground Finish	710	430	34	242	100	7.96	193
Precision Ground	730	450	33	248	101	7.96	193

Physical Properties of ASTM A276 UNS S34700 Round Bars

The physical properties of ASTM A276 UNS S34700 round bars support applications involving elevated temperatures, thermal expansion, heat transfer, and fabrication-intensive manufacturing processes. These characteristics assist engineers in selecting suitable materials for process equipment, thermal systems, and structural components.

Physical Properties of Stainless Steel 347 Round Bars

Density kg/m³	Melting Range °C	Thermal Conductivity W/m.K	Specific Heat J/kg.K	Thermal Expansion µm/m°C	Electrical Resistivity µΩ.m	Elastic Modulus GPa	Magnetic Permeability
7960	1398–1454	16.3	500	17.3	0.73	193	1.02
7960	1398–1454	16.5	500	17.4	0.73	193	1.02
7960	1398–1454	16.4	500	17.3	0.72	193	1.01
7960	1398–1454	16.3	500	17.2	0.72	193	1.01
7960	1398–1454	16.4	500	17.3	0.73	193	1.02
7960	1398–1454	16.5	500	17.4	0.73	193	1.02

High Temperature Performance of Stainless Steel 347 Round Bars

ASTM A276 AISI 347 Stainless Steel Round Bars are extensively used in applications where elevated-temperature strength and resistance to sensitization are critical. The niobium stabilization mechanism improves thermal stability and helps maintain corrosion resistance during long-term exposure to heat.

High Temperature Service Performance

Temperature °C	Strength Retention	Oxidation Resistance	Thermal Stability	Corrosion Resistance	Service Recommendation
100	Excellent	Excellent	Excellent	Excellent	Continuous Service
300	Excellent	Excellent	Excellent	Excellent	Continuous Service
500	Very High	Excellent	Excellent	Excellent	Continuous Service
650	High	Excellent	Excellent	Very High	Continuous Service
750	High	Excellent	Very High	Very High	Continuous Service
850	Moderate	Excellent	High	High	Intermittent Service
900	Moderate	Very High	High	High	Intermittent Service
925	Moderate	High	Moderate	High	Limited Exposure

ASTM A276 Stainless Steel 347 Round Bar Specifications and Available Sizes

Steel House India supplies ASTM A276 AISI 347 Stainless Steel Round Bars in various dimensions, manufacturing conditions, and surface finishes to support industrial fabrication, machining, refinery infrastructure, thermal processing systems, and pressure equipment manufacturing.

Product Forms and Size Range

Product Form	Diameter Range	Length	Surface Finish	Supply Condition	Availability
Bright Bars	3 mm – 100 mm	3–6 Meters	Bright	Cold Drawn	Available
Cold Drawn Bars	5 mm – 120 mm	3–6 Meters	Smooth	Finished	Available
Hot Rolled Bars	16 mm – 350 mm	3–6 Meters	Black	Hot Rolled	Available
Forged Bars	130 mm – 500 mm	Custom	Forged	Forged	Available
Ground Bars	5 mm – 90 mm	3–6 Meters	Ground	Precision Finished	Available
Peeled Bars	20 mm – 150 mm	3–6 Meters	Peeled	Finished	Available
Polished Bars	6 mm – 80 mm	3–6 Meters	Polished	Bright Finish	Available

Dimensional Tolerance Chart

Diameter Range	h8 mm	h9 mm	h11 mm	Straightness mm/m	Ovality mm	Length Tolerance mm
3–6 mm	±0.022	±0.036	±0.090	0.50	0.01	±2
6–12 mm	±0.027	±0.043	±0.110	0.50	0.01	±2
12–30 mm	±0.033	±0.052	±0.130	0.50	0.02	±2
30–50 mm	±0.039	±0.062	±0.160	0.80	0.03	±3
50–80 mm	±0.046	±0.074	±0.190	0.80	0.03	±3
80–120 mm	±0.054	±0.087	±0.220	1.00	0.05	±5
120–200 mm	±0.063	±0.100	±0.250	1.00	0.06	±5

Industrial Applications of ASTM A276 UNS S34700 Round Bars

ASTM A276 UNS S34700 round bars are widely used in industries requiring reliable performance under elevated temperatures, thermal cycling conditions, and corrosive operating environments. The combination of high-temperature stability and corrosion resistance makes the material suitable for critical process equipment and engineered systems.

Industrial Application Matrix

Industry	Operating Temperature	Corrosion Exposure	Fabrication Requirement	Typical Components	Performance Benefit
Petrochemical	High	High	High	Heater Components	Thermal Stability
Refinery	Very High	High	High	Furnace Assemblies	Oxidation Resistance
Power Generation	High	Medium	Medium	Boiler Components	Elevated Temperature Strength
Aerospace	Very High	Medium	High	Structural Components	Heat Resistance
Heat Exchangers	High	Medium	High	Support Assemblies	Weld Stability
Pressure Equipment	High	Medium	High	Pressure Components	Structural Reliability
Thermal Processing	Very High	Medium	High	Furnace Hardware	Long Service Life
Chemical Processing	Medium	High	High	Reactor Components	Corrosion Resistance

ASTM A276 AISI 347 Stainless Steel Round Bar Standards and Testing

ASTM A276 compliance ensures that Stainless Steel 347 Round Bars meet established requirements for chemical composition, mechanical properties, dimensional accuracy, and material quality. Inspection and testing procedures help verify compliance with procurement specifications and engineering standards.

Equivalent Standards

ASTM	AISI	UNS	EN	DIN	JIS	Werkstoff No.
ASTM A276	347	S34700	X6CrNiNb18-10	1.4550	SUS347	1.4550
ASTM A479	347	S34700	X6CrNiNb18-10	1.4550	SUS347	1.4550
ASTM A182	F347	S34700	X6CrNiNb18-10	1.4550	SUS347	1.4550
ASTM A240	347	S34700	X6CrNiNb18-10	1.4550	SUS347	1.4550

Inspection and Testing

Test Type	Standard	Inspection Method	Frequency	Certification
PMI Testing	ASTM	Spectrometer	Batch Wise	Available
Tensile Testing	ASTM E8	UTM Testing	Batch Wise	Available
Hardness Testing	ASTM E18	Brinell/Rockwell	Batch Wise	Available
Chemical Analysis	ASTM Standards	Spectrometer	Batch Wise	Available
Ultrasonic Testing	ASTM A388	UT Inspection	As Required	Available
Dimensional Inspection	ASTM A276	Precision Instruments	100% Inspection	Available
Surface Inspection	ASTM A480	Visual Examination	100% Inspection	Available

Why Choose Steel House India for ASTM A276 UNS S34700 Round Bars

Steel House India supplies ASTM A276 AISI 347 Stainless Steel Round Bars for industrial applications requiring elevated-temperature reliability, corrosion resistance, dimensional consistency, and compliance with recognized material specifications. Materials are supplied in multiple conditions and dimensions to support fabrication contractors, equipment manufacturers, refinery projects, thermal processing facilities, and engineering procurement teams seeking dependable stainless steel solutions.

Supply Capability

Supply Capability	Details
Product Standard	ASTM A276
Material Grade	AISI 347 / UNS S34700
Product Type	Stainless Steel Round Bars
Supply Condition	Bright, Cold Drawn, Hot Rolled, Forged
Custom Cutting	Available
PMI Testing	Available
Material Traceability	Available
Mill Test Certificates	Available
Bulk Supply	Available
Project Supply	Available

Stainless Steel 347 Round Bar Supplier for High Temperature Process Equipment

ASTM A276 AISI 347 Stainless Steel Round Bars are widely specified for refinery systems, thermal processing equipment, aerospace components, pressure-retaining assemblies, and industrial applications requiring elevated-temperature stability and corrosion resistance. Their niobium-stabilized structure helps maintain performance during prolonged thermal exposure, making them suitable for demanding fabrication and engineering environments where reliability and material integrity are critical. Steel House India supplies Stainless Steel 347 Round Bars in multiple sizes, surface finishes, and manufacturing conditions to support industrial procurement requirements across India. For applications where machining performance and free-cutting characteristics are prioritized over high-temperature stabilization, buyers may also evaluate Stainless Steel 303 Round Bars Manufacturers in India as part of their material selection process.