ASTM A193 Grade B8MLN & B8MLNA Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for ASTM A193 Grade B8MLN and B8MLNA (Low-Carbon, Nitrogen-Strengthened 316 / UNS S31653). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This ASTM A193 B8MLN / B8MLNA MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for highly specialized, marine-grade, weld-friendly austenitic stainless steel fasteners shipped from Ananka Fasteners Pvt Ltd.
- Full Traceability: Certified with TC No.: S128/26-XX and corresponding ASTM specifications.
- Advanced Molybdenum & Low-Carbon Chemistry: Detailed breakdowns verifying the addition of Molybdenum (2.00% - 3.00%) for elite pitting resistance, combined with restricted Carbon (0.030% max) to prevent carbide precipitation during welding or high-temperature exposure.
- Nitrogen Strengthening: Because low carbon reduces strength, Nitrogen (0.10% - 0.16%) is strategically added. This acts as an interstitial solid-solution strengthener, boosting the yield strength back to, or above, standard B8M structural levels.
- Solution Treatment Verification: Confirms the material is carbide solution treated. For B8MLNA (Class 1A), it specifically verifies the treatment occurred in the finished condition, ensuring optimum toughness and a stress-free microstructure.
- Mechanical Properties: Comprehensive reporting of Tensile Strength (Min 515 MPa), Yield Strength (Min 205 MPa), Elongation (Min 30%), and controlled maximum Hardness (96 HRB for B8MLN, 90 HRB for B8MLNA).
Live Preview: ASTM A193 Grade B8MLN & B8MLNA MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S128/26-XX
TC Date
28.09.20XX
Material Spec
ASTM A193 Grade B8MLNA Class 1A UNS S31653
Bar Shape / Size
Hex Bolt / M20
Dimensions / Item
Heavy Hex Bolt M20-2.5P x 100 mm
Quantity
80.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 0.025 | 1.55 | 0.026 | 0.010 | 0.55 | 16.50 | 11.50 | 2.20 | 0.14 | 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 Properties
| TENSILE STRENGTH (Mpa) | YIELD STRENGTH 0.2% Offset (Mpa) | % ELONGATION (GL-50mm) | HARDNESS (HRB) |
|---|---|---|---|
| 565.00 | 250.00 | 44.00 | 84, 85, 83 |
| Min: 515 | Min: 205 | Min: 30 | Max: 90 (B8MLNA) Max: 96 (B8MLN) |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for fasteners. The test reports confirm compliance with As Per ASME/ASTM A193 Grade B8MLN / B8MLNA UNS S31653 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 Perform. |
| Dimensional Accuracy | All Dimensions are as per PO Specification. |
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 (In Finished Condition for B8MLNA)
- Quenching Medium: Water quenched
Testing Conditions
- Chemical, Mechanical & hardness test carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — ASTM A193 Grade B8MLN & B8MLNA MTC Certificate
Why use Grade B8MLN instead of standard B8M (316) or B8ML (316L)?
Standard B8ML (316L) has a restricted carbon limit (0.030% max) to prevent carbide precipitation and sensitization during welding in harsh chemical or marine environments. However, lower carbon naturally reduces the fastener's tensile and yield strength. Grade B8MLN solves this by adding Nitrogen (0.10% - 0.16%). The nitrogen acts as an interstitial solid-solution strengthener, restoring the yield strength back up to the levels of standard B8M (316) while maintaining full weldability and elite resistance to pitting corrosion.
What is the difference between Grade B8MLN and B8MLNA?
Grade B8MLN (Class 1) is carbide solution treated before the final machining and threading processes. Grade B8MLNA (Class 1A) is carbide solution treated in the finished condition. Solution treating the completely formed bolt removes any residual stresses generated during manufacturing. This guarantees maximum resistance to stress-corrosion cracking and maintains a strict 90 HRB maximum hardness limit, whereas B8MLN is allowed up to 96 HRB.
Are the materials verified to be free from radioactive contamination?
Yes, the MTC document strictly states that the material has been verified as free from radioactive contamination and has undergone a 100% visual inspection to ensure it is completely free from manufacturing defects before dispatch.