STAINLESS STEEL GRADE 347H (UNS S34709) – MTC
Stainless Steel 347H Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Stainless Steel Grade 347H (ASTM A276 / A479 UNS S34709). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This SS 347H MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for stabilized, highly heat-resistant austenitic stainless steel orders shipped from Ananka Fasteners Pvt Ltd.
- Full Traceability: Certified with TC No.: S115/26-XX and corresponding ASTM specifications to ensure seamless part-tracking.
- Columbium (Niobium) Stabilization: Detailed breakdowns verifying the addition of Columbium (Niobium) and Tantalum. This critical alloying element stabilizes the material against chromium carbide precipitation during welding and high-temperature service.
- High Carbon Verification (The 'H' Grade): Explicit verification of the strictly controlled elevated carbon content (0.04% - 0.10%). This is the defining characteristic of 347H, ensuring maximized high-temperature creep resistance.
- Mechanical Properties: Comprehensive reporting of Tensile Strength (Min 515 MPa), Yield Strength (Min 205 MPa), Elongation (Min 40%), and Hardness (Max 92 HRB).
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: Stainless Steel 347H MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S115/26-XX
TC Date
05.04.20XX
Material Spec
ASTM A276 / A479 UNS S34709
Bar Shape / Size
Hex Bar / 36 mm
Dimensions / Item
Heavy Hex Nut M36
Quantity
120.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Nb (Cb) + Ta | Fe |
|---|---|---|---|---|---|---|---|---|
| 0.06 | 1.50 | 0.025 | 0.005 | 0.60 | 17.50 | 10.50 | 0.65 | Rem |
| Min: 0.04 Max: 0.10 |
Max: 2.00 | Max: 0.045 | Max: 0.030 | Max: 1.00 | Min: 17.00 Max: 19.00 |
Min: 9.00 Max: 13.00 |
Min: 8xC Max: 1.00 |
Rem |
Mechanical Properties
| TENSILE STRENGTH (Mpa) | YIELD STRENGTH 0.2% Offset (Mpa) | % ELONGATION (GL-50mm) | HARDNESS (HRB) |
|---|---|---|---|
| 560.20 | 245.80 | 46.50 | 82, 84, 81 |
| Min: 515 | Min: 205 | Min: 40 | Max: 92 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for structural integrity in extreme heat and heavy welding environments. The test reports confirm compliance with As Per ASME/ASTM A276 / A479 UNS S34709 EDT. 20XX with respect to the tests carried out.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Safety Requirements | Material is free from radioactive contamination. |
| Weld Repairs | No weld repair Perform. |
| Dimensional Accuracy | All Dimensions are as per PO Specification. |
Certification Details
We confirm that above mentioned Items was Manufactured, Sampled, Tested and Inspected in accordance with the subjected Customer's Purchase Order and as applicable Drawings, Material Specifications, Codes & Standards and the results of the items have been determined to meet the users' requirements.
Documentation Standard
- EN 10204-2004: 3.1 Standard
- Free from radioactive contamination
- Certified ISO 9001: 2015 Company
Heat Treatments
- Solution Annealed
- Quenching Medium: Water quenched
Testing Conditions
- Chemical, Mechanical & hardness test carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — Stainless Steel 347H MTC Certificate
What is the role of Columbium (Niobium) in 347H Stainless Steel?
Grade 347H is uniquely alloyed with Columbium (also known as Niobium) and Tantalum. As shown in the MTC chemistry block, the concentration of these elements must be at least 8 times the carbon content. This acts as a stabilizer, preventing the depletion of chromium (carbide precipitation) at the grain boundaries when the material is exposed to temperatures between 800°F and 1500°F. This guarantees excellent intergranular corrosion resistance, particularly after welding.
Why choose the "H" designation for high-temperature applications?
While the Columbium in standard 347 prevents corrosion during heat exposure, the "H" designation specifically enforces a higher carbon range (0.04% to 0.10%). This intentional carbon level provides significantly greater structural strength and creep resistance at elevated temperatures, making 347H the preferred choice for heavy load-bearing components in high-heat environments.
What are the typical maximum operating temperatures for 347H?
Because of its stabilized austenitic structure, 347H is widely used in heavy welded equipment where annealing after welding is not possible. It is highly effective in continuous service up to 1600°F (870°C). Common applications include petroleum refinery piping, fluid catalytic cracking units, boiler tubes, and heavy-duty exhaust manifolds.