ASTM A194 GRADE 8MN NUTS
ASTM A194 Grade 8MN Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Nitrogen-Strengthened Austenitic Stainless Steel Fasteners (ASTM A194 Grade 8MN / AISI 316N / UNS S31651). Verify precise chemical layouts, strict mechanical testing parameters, and solution annealing conditions mapped for high-pressure and elevated temperature environments.
What's Inside This A194 Grade 8MN MTC Certificate
This sample mill test certificate mirrors the strict QA documentation package standard for Nitrogen-strengthened AISI 316N austenitic stainless steel heavy hex nuts shipped for critical high-load applications globally.
- Full Traceability: Certified under unique tracking identification TC No.: S49/26-XX, fully cross-referenced with mill heat numbers to guarantee authentic raw material verification.
- Nitrogen Interstitial Strengthening: Detailed analysis verifying controlled Nitrogen addition (0.10-0.16%), providing significantly higher yield and proof load capacity compared to standard non-nitrogen austenitic grades without losing toughness.
- Molybdenum-Enhanced Protection: Precise chemical breakdown confirming standard Molybdenum content (2.00-3.00%) coupled with Chromium (16.00-18.00%) to fully eliminate localized crevice corrosion and pitting.
- Mechanical Performance Limits: Standard reporting confirming verified Brinell limits up to 300 HBW (or 32 HRC Rockwell maximum) matching criteria defined for reliable structural load handling.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 8MN MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S49/26-XX
TC Date
25.08.20XX
Material Spec
ASTM A194 Grade 8MN (AISI 316N / UNS S31651)
Nut Profile / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20 x 2.5P
Quantity
500.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 0.054 | 1.52 | 0.032 | 0.012 | 0.46 | 17.20 | 11.45 | 2.25 | 0.128 | Rem |
| Max: 0.080 | Max: 2.000 | Max: 0.045 | Max: 0.030 | Max: 1.000 | Min: 16.00 Max: 18.00 |
Min: 11.00 Max: 14.00 |
Min: 2.00 Max: 3.00 |
Min: 0.10 Max: 0.16 |
Rem |
Mechanical & Hardness Properties
| BRINELL HARDNESS (HBW) | ROCKWELL HARDNESS (HRC) | PROOF LOAD STRESS (MPa) |
|---|---|---|
| 192 | 11 | 530 |
| Max: 300 | Max: 32 | Min: 515 (Heavy Hex Structural Standard) |
Standard References & Compliance
Our material quality records match structural limits required by maritime networks, chemical fluid transport systems, and high-load civil structural assemblies. The surfaces pass visual checks with no anomalies found.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Safety Requirements | Material is certified free from radioactive contamination. |
| Weld Repairs | No weld repairs performed on finished stainless elements. |
| Dimensional Accuracy | All heavy hex sizing verified against ASME B18.2.2 parameters. |
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 Compliance
- Free from radioactive contamination
- Certified ISO 9001: 2015 Operation
Heat Treatments
- Solution Annealed above 1040°C (1900°F)
- Rapidly Quenched in water or liquid medium
Testing Conditions
- Hardness limits and proof load tracked at 25°C
- 100% thread clearance testing performed
Technical FAQs — ASTM A194 Grade 8MN MTC Certificate
What specific advantages does Nitrogen alloying introduce to Grade 8MN nuts?
The "N" designator in ASTM A194 Grade 8MN highlights a deliberate interstitial addition of Nitrogen (0.10% to 0.16%) to the core austenitic balance (based on AISI 316N). Nitrogen acts as a robust solid-solution strengthener, which substantially raises the minimum yield strength and proof load rating compared to standard Grade 8M or 316 elements, while entirely retaining excellent low-temperature impact ductility.
How does Grade 8MN control localized crevice corrosion and pitting?
Grade 8MN utilizes an AISI 316N chemical foundation carrying between 2.00% to 3.00% Molybdenum and 16.00% to 18.00% Chromium. This unique mixture drastically enhances the material's Pitting Resistance Equivalent Number (PREn), making it far more capable of handling harsh chloride solutions, marine boundary layers, and aggressive oil and gas processing feeds than non-molybdenum variants.
Why does the specification cap the maximum hardness closely at 300 HBW?
Capping the hardness at 300 HBW (or 32 HRC Rockwell max) serves as quality confirmation that the solution annealing treatment was fully successful. Keeping the material below this threshold preserves its optimized, un-stressed austenitic matrix form, preventing unexpected brittle cracks and reducing localized thread galling risks during high-torque assembly preloads.