• Metallica is one of the biggest stainless steel 347/347H product supplier and manufacturer in India, with over 250 customers in India and overseas. We are bulk buyers and exporters of stainless steel 347/347H pipes, fittings and flanges from our factory in India, and are able to give you the best price and quality just in time.
  • We stock all major forms of stainless steel 347/347H grade such as SS 347/347H pipes and tubes, SS 347/347H forged flange and fittings, SS 347/347H butt-welding pipe fittings, SS 347/347H elbow, SS 347/347H tee, SS 347/347H reducer, SS 347/347H stub end, gaskets, fasteners, valves, sanitary fittings etc. Being one of the largest volume stainless steel SS 347/347H supplier in Mumbai, we can guarantee you the lowest prices.
  • At Metallica Metals, we believe in selling in volume and increasing our customer base across the globe, enabling us to work on low margins. We have an extensive trader network across India and the Middle East, who buy from us on a regular basis.
  • In addition to traders, we have many EPC contractors, companies and end users in various industries as our customers for stainless steel. We are leading stainless steel 347/347H suppliers for various applications ranging from low/medium/high pressure or temperatures.
  • Our company is a professional steel enterprise, specialized in steel plate, section steel, steel bar, stainless steel etc.
Stainless Steel 347/347H Supplier, Manufacturer, Distributor, Wholesaler in India and Overseas
  • Largest Stainless Steel 347/347H Products Supplier in India, with over 100 Tons in Stock

  • We Sell Stainless Steel 347/347H Products in Price Range of Rs. 230/KG to Rs. 400/KG.

  • Our Annual Sales Volume for SS 347/347H Products is Over 400 tons.

  • SS 347/347H Pipes, are Sold with Complete Range of Related Pipe Fittings.

  • On-Time Delivery with Quality Assurance and Price Guarantee for Stainless Steel 347/347H.

What is Stainless Steel 347/347H?

Type 347 is a niobium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L. 347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel. This grade is typically used in the 800-1500˚F temperature range where it is stabilized against chromium carbide precipitation by the addition of niobium, which results in the precipitation of niobium carbides. Type 347 has excellent intergranular corrosion resistance after exposure to this temperature range, and this grade resists oxidation up to 1500˚F and has higher creep and stress rupture properties than 304/304L. It also possesses good low temperature toughness and is non-magnetic in the annealed condition. This material is stabilized against chromium carbide formation by the addition of columbium and tantalum. Since these elements have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries.  347 is non-magnetic.

Stainless Steel 347H is another stainless steel in a class of metals labeled of precipitation-hardened steels. It possesses many of the same properties and characteristics of stainless steel 347. In addition to its higher carbon content, the alloy is stabilized with an addition of columbium, or sometimes tantalum. Both these properties allow 347H to be exposed to higher temperatures than both 347 and the 304 stainless steel grades can withstand. Because of its elevated resistance to corrosion, 347H is often applied in high stress, high corrosion environments where exposure tends to be severe. High temperature manufacturing, steam pipes, boiler tubes, chemical processes and steam servicing all benefit from 347H’s resilience. This resilience in turn is due to the potentially elevated levels of chromium in 347H’s composition. The metal can contain anywhere from 4-30%.
The metal displays high workability under most common welding techniques. It can be treated with heat, however, it will not respond. Only cold working is sufficient to increase 347H’s toughness and strength.

What is the Difference Between SS 304, SS 316, SS 317, SS 321, SS 321H and SS 347?

Alloy 347 stainless steel tubing offers higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns. 347 stainless steel offers good mechanical properties with higher creep and stress rupture characteristics than other grades, such as 304.

Difference between 321 and other grades:

Type 304

The most common of austenitic grades, containing approximately 18% chromium and 8% nickel. It is used for chemical processing equipment, for food, dairy, and beverage industries, for heat exchangers, and for the milder chemicals.

Type 316

Contains 16% to 18% chromium and 11% to 14% nickel. It also has molybdenum added to the nickel and chrome of the 304. The molybdenum is used to control pit type attack. Type 316 is used in chemical processing, the pulp and paper industry, for food and beverage processing and dispensing and in the more corrosive environments. The molybdenum must be a minimum of 2%.

Type 317

Contains a higher percentage of molybdenum than 316 for highly corrosive environments. It must have a minimum of 3% “moly”. It is often used in stacks which contain scrubbers.

Type 317L

Restricts maximum carbon content to 0.030% max. and silicon to 0.75% max. for extra corrosion resistance.

Type 317LM

Requires molybdenum content of 4.00% min.

Type 317LMN

Requires molybdenum content of 4.00% min. and nitrogen of .15% min.

Type 321
Type 347

These types have been developed for corrosive resistance for repeated intermittent exposure to temperature above 800 degrees F. Type 321 is made by the addition of titanium and Type 347 is made by the addition of tantalum/columbium. These grades are primarily used in the aircraft industry.

Applications of 347/347H

  • Chemical Processing
  • Food Processing equipment and storage
  • Petroleum Refining fluid catalytic cracking units, Polythionic acid service
  • Pharmaceutical Production
  • Waste Heat Recovery recuperators
  • Boiler casings
  • Cabin heaters
  • Furnace heating elements
  • Heavy wall welded equipment
  • Welded construction and parts subjected to heating in the carbide precipitation range
  • Aircraft collector rings
  • Aircraft exhaust stacks
  • Stainless Steel Reheater Tubes
  • Superheater Tubes for Boiler
  • Carburetor air intensifier tubes
  • Exhaust manifolds
  • Fasteners
  • Fire walls
  • Carburetor air intensifier tubes
  • Flash boilers
  • Flexible couplings
  • Jet engine parts
  • Large mufflers for stationary diesel engines
  • Pressure vessel
  • Stack liners
  • All-welded tank car for carrying chemicals
  • Annealing box inner covers
  • Expansion joints
  • Heat resistors
  • Welded tanks for storing organic chemicals
  • Wire cloth and screens (industrial).
  • High temperature chemical processes
  • Heat exchanger tubes
  • High temperature steam service
  • High pressure steam pipes
  • Radiant superheaters
  • Heavy duty exhaust systems
  • General refinery piping

Characteristics, Creep Properties, Limitations and Processing of Stainless Steel 347/347H


  • Higher creep stress and rupture properties when compared with 304
  • Ideal for high temperature service
  • Overcomes sensitization and intergranular corrosion concerns
  • Can be used in elevated temperature applications
  • Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L

Creep Properties

Typical creep and stress rupture data for Alloys 321 and 347 stainless steel are shown in the figures below. The elevated temperature creep and stress rupture strengths of the stabilized steels are higher than those of unstabilized Alloys 304 and 304L. These superior properties for the 321 and 347 alloys permit design of pressure-containing components for elevated temperature service to higher stress levels as recognized in the ASME Boiler and Pressure Vessel Code.


Alloy 347 stainless steel plate doesn’t perform well in chloride solutions, even in small concentrations, or in sulfuric acid.

Processing / Welding

  • 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
  • Oxyacetylene welding is not preferred for 347Hsteel.
  •  Superior general corrosion resistance over Type 321 due to stabilization with columbium.
  • Reduced tendencies to form continuous networks of chromium carbides at the grain boundaries.
  • Better high temperature properties than 304 or 304L. Generally used for parts which are intermittently heated up to 1500 deg. F. For continuous service the maximum temperature is 1650 deg. F.
  • Type 347H has high carbon (.04 – . 10) for better high temperature creep properties.
  • Improved intergranular corrosion resistance.

Product Specification

Product TP347/347H, 1.4550/1.4961, UNS S34700/UNS34709 Stainless Steel

A/SA249, AMS 5646 ASTM A182 ASTM A213 ASTM A269 ASTM A276 ASTM A312 ASTM A314 ASTM A473 QQS 763 ASME SA182 EN10204 DIN3.1B

  • AISI 347H
  • UNS S34709
  • En 1.4961
  • DIN X 6 CrNiNb 18 10
  • X8CrNiNb 16-13
  • Z6CNNb 18.10
  • SAE 30347H
  • SUS 347H
  • 347S51
  • Alloy 304H, 321H could be possible alternative to AISi 347H with comprimise in intergranular
Type and Form Straight, Coiled, Seamless, Seam welded, cold redrawn and annealed

  • Round, Square, Hexagon & Flat Bars
  • Seamless / Welded Pipes
  • Seamless / Welded Tubes
  • Hot & Cold Rolled Plates & Sheets
  • Forged Bars
  • Buttweld Pipe Fittings
  • Forged Fittings
  • Ferrule Compression Fittings
  • Forged Flanges
  • Valves
  • Guages
Size Seamless Pipe: 1/2″ – 12″
Welded Pipe: 8″ – 12″
Butt-Weld Flanges: 1/2″ – W
Bar: 1″ – 12″
Sheet: 0.018″ – 0.130″
Bar: 0.3125″ – 8.000″
End Plain End, Beveled End, Threaded
Length 6 Meter, Custom Lengths, Single Random, Double Random
Other Grades TP304, TP304L, TP304LN, TP316, TP316Ti, TP316H, TP316L, TP316LN, TP317, TP317/317L, TP321, TP347, TP310S, Tp347H
Test Certificates Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
ASTM Reference Standards
  • A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels.
  • A370 Test Methods and Definitions for Mechanical Testing of Steel Products.
  • A480 A480M Specification for general requirements for Flat-rolled stainless and Heat-Resisting steel plate, sheet, and strip.
  • A632 Specification for Seamless and welded austenitic stainless-steel tubing (small-diameter) for general service.
  • A1016 A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless-Steel Tubes.
  • E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
Testing Mechanical Testing Such as Tensile of Area, Hardness Test, Chemical Analysis – Spectro Analysis, Positive Material Identification – PMI Testing, Flattening Test, Micro and MacroTest, Pitting Resistance Test, Flaring Test, Intergranular Corrosion (IGC) Test
Documents Commercial Invoice, Packing List, Certificate of Origin, Fumigation Certificates, Raw Material Test Reports, Material Traceability Records, Quality Assurance Plan (QAP), Heat Treatment Charts, Test Certificates certifying NACE MR0103, NACE MR0175, Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Guarantee Letter, NABL approved Laboratory Test Reports

Available thicknesses for Alloy 347/347H

3/16″ 1/4″ 5/16″ 3/8″ 1/2″ 5/8″ 3/4″ 7/8″ 1″ 1 1/8″
4.8mm 6.3mm 7.9mm 9.5mm 12.7mm 15.9mm 19mm 22.2mm 25.4mm 28.6mm
1 1/4″ 1 1/2″ 1 3/4″ 2″ 2 1/4″ 2 1/2″ 2 3/4″ 3″ 3 1/2″ 4″
31.8mm 38.1mm 44.5mm 50.8mm 57.2mm 63.5mm 69.9mm 76.2mm 88.9mm 101.6mm

Chemical, Mechanical and Physical Properties of 347/347H


UNS S34700 S34709
WERKSTOFF NR. 1.4550 1.4961

ASTM Specification

Pipe / Tube (SMLS) Sheet / Plate Bar Forging Fitting
A 213 A 240, A 666 A 276 A 182 A403

Chemical Composition

ELEMENT 347 347H
NI 17.0 – 20.0 17.0 – 19.0
C 0.08 max 0.04 – 0.10
MN 2.0 max 2.0 max
P 0.045 max 0.045 max
S 0.030 max 0.030 max
SI 1.0 max 1.0 max
CR 17.0 – 19.0 17.0 – 19.0
NB 10xC – 1.10 8xC – 1.10

Physical Properties

Units Temperature in °C
Density 7.97 g/cm³
Specific Heat 0.12 Kcal/kg.C
Melting Range 1398 – 1446 °C
Modulus of Elasticity 193 KN/mm²
Electrical Resistivity 72 µΩ.cm
Coefficient of Expansion 16.0 µm/m °C
Thermal Conductivity 16.3 W/m -°K
Annealed 1040 – 1100 (°C) / 1900 – 2000 (°F)
Quenched Rapid Air/Water

Mechanical Properties

Tensile Strength (ksi) 0.2% Yield Strength (ksi) Elongation% in 2 inches
75 30 40

Fabrication Data


Stainless steel 304 are not tougher than stainless steel 347; this material will produce the same tough stringy chips. For work harden, slow speeds and heavy feeds will minimize this alloy’s tendency.

Hot Working

Working temperatures of 2100-2250 F (1149-1232 C) are suggested for forging, upsetting and other hot work process. Don’t work this alloy at temperatures beneath 1700 F (927 C). Material must be water quenched or completely annealed after working to reattain maximum corrosion resistance.

Cold Working

In spite of the fact that this material requires higher initial forces than 304 stainless steels, it is slightly tough and ductile and can be easily stamped, blanked, spun and drawn.

Heat Treatment and Resistance


1850-2000 F (1010-1093 C), water quenches. This process will result in maximum ductility. 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 intergranular corrosion


This alloy doesn’t harden by heat treating. High properties may only be obtained through cold reduction.

Stabilizing Heat Treatment

Both solution heat treatment and stabilizing heat treatment are used to reduce susceptibility to intergranular stress corrosion and embrittlement also to increase high temperature creep strength. Types 321 and 347 stainless steels are the alloys most commonly thermally stabilized, but these alloys are also susceptible to weld and HAZ cracking problems during these heat treatment procedures, i.e., reheat cracking and grain boundary liquation cracking (mechanism covered in a previous article). This susceptibility increases with increasing component thickness. Therefore, another part of the QA/QC program should include some type of surface (PT) and volumetric (UT) inspection. Remember that these cracking mechanisms can be subsurface only.

Corrosion Resistance

  • Alloy 347 stainless steel plate displays good general corrosion resistance that is similar to 304.
  • Used for applications where alloys such as Alloy 304 are vulnerable to intergranualr corrosion
  • It was produced for use in the chromium carbide precipitation scope by 800 – 1500°F (427 – 816°C) where unbalanced alloys such as 304 are subject to intergranular attack.  In this temperature scope, the overall corrosion resistance of Alloy 347 stainless steel plate is better than Alloy 321 stainless steel plate.
  • Alloy 347 is preferred over Alloy 321 for aqueous and other low temperature environments in strongly oxidizing situations up to 1500°F (816°C).
  • Primarily used in high temperature environments where resistance to sensitization is necessary, in turn preventing intergranualr corrosion at lower levels.
  • The alloy can be utilized as a part of nitric solutions; most diluted organic acids at moderate temperatures and in pure phosphoric acid at lower temperatures and up to 10% diluted solutions at high temperatures.
  • Susceptible to stress corrosion cracking
  • Exhibits oxidation resistance similar to all other 18-8 austenitic stainless steels
  • It can also be used in chloride or fluoride free caustic solutions at moderate temperatures.

Surface Treatment

  1. NO.1: surface treated with heat treatment and pickling after hot rolling.
    Generally used for cold rolling materials, industrial tank tanks, chemical industrial equipment, etc.
  2. NO.2D: matt cold rolled products obtained by heat treatment and pickling after cold rolling.
    Used for automobile parts, decoration materials, pipes, etc.
  3. NO.2B: NO.2D products after temperature-adjusted rolling have better gloss and flatness than NO.2D surfaces.
    The surface treatment with improved mechanical properties satisfies almost all USES.
  4. NO.3: NO.2D surface is ground by NO. 100~120 grinding band, with good gloss and discontinuous coarse grain.
    Used for interior and exterior decoration, electrical products and kitchen equipment, etc.
  5. NO.4: NO.2D surface after 150~320 abrasive belt grinding products, with better gloss and discontinuous coarse lines, stripes smaller than NO.3.
    Used for elevator decoration, kitchen equipment, interior and exterior decoration, electrical products, etc.
  6. HL: no.2d surface is continuously ground by polishing sand belt with appropriate particle size, and products with long continuous grinding stripes (subdivided 150~320).
    Mainly used for building decoration, elevator decoration, etc.
  7. BA: after cold rolling, a bright annealing is applied and the product is obtained through leveling.
    The surface has excellent gloss and high reflectance.
    It’s like a mirror surface.
    Used for household appliances, mirrors, kitchen equipment, decorative materials, etc.

Over 200 Tons in Stock for 347/347H Stainless Steel Products!

As one of the biggest 347/347H stainless steel stockholder and supplier in India, Metallica carries inventory of over 200 tons in its warehouses in Mumbai, Maharashtra India. We sell our 347/347H steel products throughout India, and to international clients.

How are Steel Pipes Certified?

Certification of Steel Pipes

Manufacturers issue a Material Test Report or Mill Test Report to validate that the product meets the chemical analysis and mechanical properties specification. The MTR will contain all relevant data to the product and will accompany the product through its lifecycle.

The following are typical parameters that may be recorded on an MTR:

  • Chemical composition including carbon content, alloys, and sulfur
  • Material size, weight, identification, and grade
  • Material heat number, which ties back to the processing batch
  • Mechanical properties like tensile strength, yield strength, and elongation

At Metallica, we will Provide you with Original MTR’s for all 347/347H Stainless Steel Pipe and its Related Products! We will Send Our Test Certificates, along with Quotation