ASTM A194 GRADE 6 & 6F NUTS
ASTM A194 Grade 6 & 6F Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Martensitic Stainless Steel Heavy Hex Nuts (ASTM A194 Grade 6 and 6F). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 6/6F MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for martensitic stainless steel fasteners, engineered to deliver an exceptional balance of mechanical strength and moderate corrosion resistance in elevated temperature environments.
- Full Traceability: Certified with TC No.: C124/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the ~12% Chromium content defining this martensitic class (similar to type 410 stainless), ensuring proper oxidation resistance up to 1100°F.
- Mechanical & Proof Load Testing: Comprehensive reporting of critical fastener metrics, validating the nut's Proof Load capability to guarantee performance under high mechanical stress.
- Heat Treatment Tracking: Verifies the necessary quenching and tempering (minimum 1100°F / 595°C) required to maximize the alloy's structural advantages and maintain the critical hardness range of 248 to 352 HBW.
- 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 6 Data
Review the standard parameters and layout before downloading the full document.
TC Number
C124/26-XX
TC Date
05.11.20XX
Material Spec
ASTM A194 GRADE 6
Nut Shape / Size
Heavy Hex Nut / M24
Dimensions / Item
Heavy Hex Nut M24-3.0P
Quantity
150.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr |
|---|---|---|---|---|---|
| 0.12 | 0.65 | 0.024 | 0.015 | 0.48 | 12.60 |
| Max: 0.15 | Max: 1.00 | Max: 0.040 | Max: 0.030* | Max: 1.00 | Min: 11.50 Max: 13.50 |
* Note: For Grade 6F (Free Machining), Sulfur (S) minimum is 0.15%, and Manganese (Mn) max is 1.25%.
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) |
|---|---|
| 985.40 | 260, 265, 258 |
| Min: 930 | Min: 248 Max: 352 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for high-temperature and moderately corrosive pipeline and structural fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 6 / 6F 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
- Quenched & Tempered
- Tempering Temperature: Min 1100°F (595°C)
Testing Conditions
- Proof load & hardness testing carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — ASTM A194 Grade 6 & 6F MTC Certificate
What is the metallurgical difference between Grade 6 and Grade 6F?
Both grades are martensitic stainless steels (equivalent to the 400 series, typically 410 SS). However, Grade 6F is the "Free-Machining" variant (similar to 416 SS). Grade 6F incorporates a higher minimum addition of Sulfur or Selenium (0.15% min), which breaks up chips during the machining process, allowing for faster and cleaner threading, though it slightly reduces overall corrosion resistance compared to Grade 6.
Why choose martensitic stainless steel (Gr 6/6F) over austenitic (like Gr 8/8M)?
Martensitic stainless steels can be heat-treated (quenched and tempered) to achieve significantly higher hardness and mechanical strength than standard austenitic stainless steels (like 304 or 316). Grade 6 and 6F are chosen when an application requires a combination of high tensile strength, wear resistance, and moderate corrosion resistance in hot environments.
What heat treatment methodology is tracked on this certificate?
The MTC logs a Quench and Temper phase. ASTM A194 strictly mandates that Grade 6 and 6F nuts be heated to the proper austenitizing temperature, quenched in a liquid medium, and then tempered at a minimum of 1100°F (595°C). This specific tempering minimum ensures the material retains high strength while restoring enough ductility to prevent brittle failure under stress.
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