ASTM A194 GRADE 8T – MTC
ASTM A194 Grade 8T 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 8T). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 8T 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 "T" designation represents Titanium stabilization, engineered specifically to prevent intergranular corrosion during prolonged exposure to elevated temperatures.
- Full Traceability: Certified with TC No.: S321/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the unique chemistry of AISI Type 321 stainless steel. It highlights the critical addition of Titanium, which stabilizes the steel against chromium carbide precipitation (sensitization) during welding or high-temperature service (800°F - 1500°F).
- 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 extreme thermal expansion.
- 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 8T Data
Review the standard parameters and layout before downloading the full document.
TC Number
S321/26-XX
TC Date
20.05.20XX
Material Spec
ASTM A194 GRADE 8T (CLASS 1)
Nut Shape / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20-2.5P
Quantity
400.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|
| 0.05 | 1.40 | 0.025 | 0.010 | 0.50 | 17.50 | 9.50 | 0.40 |
| 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: 12.00 |
Min: 5xC Max: 0.70 |
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) |
|---|---|
| 580.40 | 160, 165, 162 |
| 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 8T 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 8T MTC Certificate
What is the base material for ASTM A194 Grade 8T?
Grade 8T is manufactured from AISI Type 321 Austenitic Stainless Steel. This specific alloy is fundamentally similar to standard Type 304 (18/8) stainless steel but features a strategic addition of Titanium (at least 5 times the carbon content). This makes it highly resistant to intergranular corrosion after extended exposure to elevated temperatures.
Why is Titanium added to this grade?
When standard austenitic stainless steels (like Grade 8) are exposed to high temperatures (800°F - 1500°F), chromium carbides can precipitate at the grain boundaries, leading to "sensitization" and subsequent corrosion cracking. The Titanium in Grade 8T has a higher affinity for carbon than chromium does; it binds with the carbon, leaving the chromium fully intact in the alloy matrix to maintain its protective oxide layer.
How does Grade 8T differ from Grade 8C?
Both Grade 8T (Type 321) and Grade 8C (Type 347) are stabilized austenitic stainless steels designed to resist carbide precipitation at high temperatures. The difference lies entirely in the stabilizing element: Grade 8T uses Titanium, whereas Grade 8C uses Columbium (Niobium) and Tantalum. They perform similarly in most high-heat applications, such as exhaust systems and heavy refinery equipment.