ASTM A194 GRADE 8MLN NUTS
ASTM A194 Grade 8MLN Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Nitrogen-Strengthened, Low-Carbon Molybdenum Austenitic Stainless Steel Fasteners (ASTM A194 Grade 8MLN / AISI 316LN). Review verified chemical distributions, solid-solution strengthening data, and specialized strain hardening tracking metrics engineered for intense structural and pressure-retaining tasks.
What's Inside This A194 Grade 8MLN MTC Certificate
This sample mill test certificate mirrors the strict QA verification package standard for nitrogen-strengthened, low-carbon molybdenum-bearing heavy hex nuts shipped for critical oil/gas processing, cryogenic storage, and harsh marine boundary environments.
- Full Traceability: Issued under unique tracking index TC No.: S52/26-XX, fully correlated with verified mill heat lot identifiers to guarantee continuous material verification.
- Nitrogen Interstitial Strengthening: Detailed chemical matrix showing the precise integration of Nitrogen (0.10-0.16%), significantly boosting room-temperature and cryogenic yield boundaries without degrading material impact toughness.
- Low-Carbon Protection: Verification of ultra-low Carbon content (0.030% max), mitigating chromium-rich carbide precipitation along grain borders during field welding operations or high-temperature exposures.
- Molybdenum Pitting Resistance: Complete chemistry mapping confirming standard Molybdenum addition (2.00-3.00%) to fully defend against localized pitting and crevice corrosion inside hostile saline streams.
- Mechanical & Hardness Limits: Comprehensive reporting of structural hardness properties maintained safely under the standard maximum of 300 HBW (32 HRC Rockwell max) to optimize shear integrity and thread load limits.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 8MLN MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S52/26-XX
TC Date
24.11.20XX
Material Spec
ASTM A194 Grade 8MLN (AISI 316LN Basis)
Nut Profile / Size
Heavy Hex Nut / M22
Dimensions / Item
Heavy Hex Nut M22 x 2.5P
Quantity
650.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 0.024 | 1.65 | 0.035 | 0.011 | 0.42 | 17.15 | 11.20 | 2.28 | 0.130 | Rem |
| Max: 0.030 | Max: 2.00 | Max: 0.045 | Max: 0.030 | Max: 1.00 | Min: 16.00 Max: 18.00 |
Min: 10.00 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) |
|---|---|---|
| 195 | 12 | 535 |
| Max: 300 | Max: 32 | Min: 515 (Heavy Hex Structural Standard) |
Standard References & Compliance
Our microstructural validation satisfies mechanical load parameters required by chemical refineries, marine frameworks, and sub-zero storage facilities. Finished surfaces pass visual evaluations with zero defects noted.
| 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 alloy elements. |
| Dimensional Accuracy | All heavy hex dimensions verified strictly per ASME B18.2.2 requirements. |
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 Compliant
- Free from radioactive contamination
- Certified ISO 9001: 2015 Operation
Heat Treatments
- Solution Annealed above 1040°C (1900°F)
- Rapidly liquid quenched to secure interstitial retention
Testing Conditions
- Mechanical proof load and hardness checks performed at 25°C
- 100% thread path conformance verified
Technical FAQs — ASTM A194 Grade 8MLN MTC Certificate
What specific advantages does Nitrogen alloying introduce to Grade 8MLN nuts?
The "N" in ASTM A194 Grade 8MLN signifies a deliberate interstitial addition of Nitrogen (0.10-0.16%). Nitrogen acts as a potent solid-solution strengthener within the austenitic matrix, significantly boosting the material's proof load capacity and yield strength compared to standard low-carbon stainless alloys, while fully preserving its cryogenic impact toughness.
How does Grade 8MLN control intergranular corrosion risks at elevated temperatures?
Grade 8MLN maintains an ultra-low carbon ceiling of 0.030% maximum ("L" designation). Capping the carbon limits chromium carbide formation along grain interfaces during operational high-temperature exposure or field welding. This keeps the Chromium fully free within the metal matrix to combine with Molybdenum (2.00-3.00%), securing superior protection against pitting and general chemical attack.
What distinguishes Grade 8MLN from Grade 8MLNA nuts under ASTM A194 parameters?
Both grades leverage an identical chemical composition base (AISI 316LN). However, under ASTM A194 definitions, Grade 8MLN nuts are typically machined from hot-finished or cold-drawn stock that has been solution treated prior to processing. Grade 8MLNA dictates that the absolute solution annealing heat treatment must be completely performed *after* final heavy hex forging or internal thread-tapping stages have taken place, relieving all cold tooling strain.