ASTM A194 GRADE 8C NUTS
ASTM A194 Grade 8C Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Stabilized Austenitic Stainless Steel Heavy Hex Nuts (ASTM A194 Grade 8C). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 8C MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for highly corrosion-resistant, high-temperature austenitic stainless steel nuts. The "C" designation represents Columbium (Niobium) stabilization, making these fasteners ideal for high-heat environments and prolonged thermal exposure.
- Full Traceability: Certified with TC No.: S347/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the unique chemistry of AISI Type 347 stainless steel. It highlights the critical addition of Columbium (Niobium) and Tantalum, which stabilizes the steel against chromium carbide precipitation during welding or high-temperature service.
- Mechanical & Proof Load Testing: Comprehensive reporting of critical fastener metrics, validating the nut's Proof Load capability (typically min 550 MPa for standard Class 1) to ensure structural integrity under sustained load.
- Heat Treatment Tracking: Verifies the essential Carbide Solution Treatment (Solution Annealing) at a minimum of 1900°F (1040°C) followed by rapid quenching to ensure optimum metallurgical structure.
- Quality Compliance: 100% visual and dimensional inspection carried out to guarantee perfectly formed threads and flat bearing surfaces in accordance with ASME B18.2.2.
Live Preview: ASTM A194 Grade 8C Data
Review the standard parameters and layout before downloading the full document.
TC Number
S347/26-XX
TC Date
15.04.20XX
Material Spec
ASTM A194 GRADE 8C (CLASS 1)
Nut Shape / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20-2.5P
Quantity
300.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Cb+Ta |
|---|---|---|---|---|---|---|---|
| 0.06 | 1.50 | 0.025 | 0.010 | 0.60 | 18.20 | 10.50 | 0.70 |
| Max: 0.08 | 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: 10xC Max: 1.00 |
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) |
|---|---|
| 588.50 | 168, 172, 165 |
| Min: 550 | Min: 126 Max: 321 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for high-temperature and highly corrosive pipeline fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 8C 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 performed. |
| Dimensional Accuracy | All dimensions, threads, and bearing surface tolerances conform to ASME B18.2.2. |
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
- Carbide Solution Treated (Annealed)
- Treatment Temp: Min 1900°F (1040°C)
- Quenching: Rapid Water Quench
Testing Conditions
- Proof load & hardness testing carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — ASTM A194 Grade 8C MTC Certificate
What is the base material for ASTM A194 Grade 8C?
Grade 8C is manufactured from AISI Type 347 Austenitic Stainless Steel. This specific alloy is similar to standard 18/8 stainless steel but features a strategic addition of Columbium (Niobium) and Tantalum, making it highly resistant to intergranular corrosion after extended exposure to elevated temperatures.
Why is Columbium/Niobium added to this grade?
When standard austenitic stainless steels (like Grade 8 / Type 304) are exposed to high temperatures (800°F - 1500°F) or welded, chromium carbides can precipitate at the grain boundaries, leading to "sensitization" and subsequent corrosion. The Columbium/Niobium in Grade 8C binds with the carbon instead of the chromium, maintaining the steel's corrosion resistance even after severe thermal exposure.
How does Grade 8C differ from Grade 8?
While Grade 8 (Type 304) is excellent for general corrosion resistance, it is susceptible to carbide precipitation at high temperatures. Grade 8C (Type 347) solves this issue with its Columbium/Niobium stabilization. Therefore, Grade 8C is the preferred choice for heavy hex nuts utilized in high-temperature applications, such as aircraft exhaust stacks, heat exchangers, and heavy welded equipment.