ASTM A193 GRADE B8MN & B8MNA BOLTS – MTC
ASTM A193 Grade B8MN & B8MNA Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for ASTM A193 Grade B8MN and B8MNA (Nitrogen Strengthened 316 / UNS S31651). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This ASTM A193 B8MN / B8MNA MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for high-strength, Nitrogen-enriched, and Molybdenum-bearing austenitic stainless steel fasteners shipped from Ananka Fasteners Pvt Ltd.
- Full Traceability: Certified with TC No.: S118/26-XX and corresponding ASTM specifications.
- Nitrogen & Molybdenum Chemistry: Detailed breakdowns verifying both the addition of Molybdenum (2.00% - 3.00%) for elite resistance to marine/chloride pitting, AND Nitrogen (0.10% - 0.16%) which acts as a powerful solid-solution strengthener to boost structural load capacities.
- Solution Treatment Verification: Confirms the material is carbide solution treated. For B8MNA (Class 1A), it specifically verifies the treatment occurred in the finished condition, ensuring optimum toughness and a stress-free microstructure.
- Enhanced Yield Strength Properties: Comprehensive reporting of Tensile Strength (Min 550 MPa), an upgraded Yield Strength (Min 240 MPa—significantly higher than standard B8M), Elongation (Min 30%), and controlled maximum Hardness (96 HRB for B8MN, 90 HRB for B8MNA).
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A193 Grade B8MN & B8MNA MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S118/26-XX
TC Date
12.06.20XX
Material Spec
ASTM A193 Grade B8MNA Class 1A UNS S31651
Bar Shape / Size
Hex Bolt / M24
Dimensions / Item
Heavy Hex Bolt M24-3.0P x 150 mm
Quantity
40.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 0.050 | 1.30 | 0.025 | 0.010 | 0.50 | 16.80 | 10.50 | 2.15 | 0.13 | Rem |
| Max: 0.08 | 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) |
|---|---|---|---|
| 590.00 | 275.00 | 45.00 | 85, 84, 86 |
| Min: 550 | Min: 240 | Min: 30 | Max: 90 (B8MNA) Max: 96 (B8MN) |
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 B8MN / B8MNA UNS S31651 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 B8MNA)
- 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 B8MN & B8MNA MTC Certificate
Why add both Nitrogen and Molybdenum to this grade?
Molybdenum (found in 316 stainless) provides essential resistance to pitting and crevice corrosion, especially in chloride-rich environments like offshore platforms or chemical processing plants. Adding Nitrogen (0.10% - 0.16%) to this mix acts as a solid-solution strengthener. This boosts the minimum yield strength of the fastener from 205 MPa (standard B8M) up to 240 MPa (B8MN) without compromising its high ductility or corrosion resistance.
What is the difference between Grade B8MN and B8MNA?
Grade B8MN (Class 1) is carbide solution treated before the final machining and threading processes. Grade B8MNA (Class 1A) is carbide solution treated in the finished condition. Solution treating the completely formed bolt removes residual stresses generated during cold working or threading. This guarantees maximum resistance to stress-corrosion cracking and maintains a strict 90 HRB maximum hardness limit, whereas B8MN 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.