ASTM A194 GRADE 8LN NUTS
ASTM A194 Grade 8LN Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Nitrogen-Strengthened, Low-Carbon Austenitic Stainless Steel Fasteners (ASTM A194 Grade 8LN / AISI 316LN). Review verified chemical matrices, interstitial strengthening properties, and solution annealing logs engineered for severe pressure and high-temperature service configurations.
What's Inside This A194 Grade 8LN MTC Certificate
This sample mill test certificate mirrors the strict QA verification package standard for nitrogen-bearing 316LN stainless steel heavy hex nuts shipped for critical petrochemical, cryogenic, and structural joint assemblies.
- Full Traceability: Issued under unique tracking index TC No.: S52/26-XX, fully correlated with verified mill heat identifiers to guarantee continuous tracking parameters.
- Nitrogen-Strengthened Chemistry: Detailed chemical matrix showing the precise addition of Nitrogen (0.10-0.16%) paired with Molybdenum (2.00-3.00%), which elevates yield capacity while safeguarding localized structural ductility.
- Low Carbon Immunity: Breakdown verifying strict boundaries on Carbon content (0.030% max), mitigating carbide precipitation along grain interfaces during prolonged high-temperature exposure or standard field welding.
- 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 8LN 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 8LN (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 clearance checking carried out
Technical FAQs — ASTM A194 Grade 8LN MTC Certificate
What specific advantages does Nitrogen alloying introduce to Grade 8LN nuts?
The "N" in ASTM A194 Grade 8LN 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 8LN control intergranular corrosion risks at elevated temperatures?
Grade 8LN 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 are the permissible hardness boundaries outlined in standard Grade 8LN specifications?
Per ASTM A194 parameters, Grade 8LN fasteners are certified with a maximum hardness threshold of 300 HBW on the Brinell scale (or approximately 32 HRC Rockwell max). Keeping the structural core within these boundaries verifies a successful solution annealing profile, protecting the threads from stripping or torque-induced assembly galling.