Property Class 14.9 Ultra-High-Strength MTC Sample
Access a comprehensive, professionally formatted Material Test Certificate for Property Class 14.9 Ultra-High-Strength fasteners. Review the documentation verifying extreme tensile performance (1400 MPa), precise hardness control, and mandatory hydrogen de-embrittlement verification.
What's Inside This Class 14.9 MTC
This sample MTC highlights the rigorous metallurgical standards required for the 14.9 property class. These fasteners are engineered for extreme loading scenarios where standard 12.9 grade fasteners would be inadequate.
- Full Traceability: Certified with TC No.: S450/26-XX, mapped to proprietary high-strength specifications for aerospace and performance engineering.
- Micro-Alloyed Chemistry: Verifies the use of advanced martensitic steels (e.g., 40CrNiMo) with extremely low impurity levels to prevent micro-cracking under ultra-high stress.
- Hydrogen De-embrittlement (HDE): Explicitly logs the mandatory post-treatment baking cycle, essential for maintaining toughness at 1400 MPa tensile strength.
- Mechanical Performance: Detailed logs conforming to class 14.9 requirements: Tensile Strength (Min 1400 MPa), Yield Strength (Min 1260 MPa), and Hardness (44 - 50 HRC).
- Quality Compliance: 100% visual inspection and full batch hardness mapping to ensure zero-defect conformance for mission-critical applications.
Live Preview: Property Class 14.9 MTC Data
Review the extreme mechanical and hardness limits before downloading.
TC Number
S450/26-XX
TC Date
23.06.20XX
Material Spec
Class 14.9 (40CrNiMo)
Bar Shape / Size
Round Bar / 12 mm
Dimensions / Item
Socket Head Bolt M12-1.75P x 50 mm
Quantity
250.00 NOS
Chemical Composition % (Typical Micro-Alloyed)
| C | Mn | Cr | Ni | Mo | S | P |
|---|---|---|---|---|---|---|
| 0.40 | 0.80 | 1.10 | 0.50 | 0.25 | 0.008 | 0.010 |
| 0.38 - 0.42 | 0.70 - 0.90 | 1.00 - 1.20 | 0.40 - 0.60 | 0.20 - 0.30 | Max: 0.010 | Max: 0.015 |
Mechanical Properties
| TENSILE STRENGTH (MPa) | YIELD STRENGTH 0.2% Offset (MPa) | % ELONGATION (GL-5d) | HARDNESS (HRC) |
|---|---|---|---|
| 1420.50 | 1280.20 | 8.00 | 46, 47, 46 |
| Min: 1400 | Min: 1260 | Min: 7% | 44 - 50 |
Standard References & Compliance
Our MTC certificates for Class 14.9 fasteners are strictly controlled, mirroring aerospace and high-performance automotive manufacturing protocols. All batches are heat-certified and HDE-verified.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Hydrogen De-embrittlement | Passed mandatory post-plating bake cycle verification. |
| Hardness Testing (100%) | Every unit verified to be within 44-50 HRC range. |
| Dimensional Accuracy | All Dimensions are as per PO Specification / ASME B18.3. |
Certification Details
We confirm that the above mentioned items were Manufactured, Sampled, Tested, and Inspected in accordance with the subjected Customer's Purchase Order and applicable Drawings, Material Specifications, Codes & Standards.
Documentation Standard
- EN 10204-2004: 3.1 Standard
- Free from radioactive contamination
- Certified ISO 9001: 2015 Company
Heat Treatments
- Quenched & Tempered
- Hydrogen De-embrittlement (Baking)
Testing Conditions
- 100% Hardness Tested
- Mechanical tests performed at room temp
Technical FAQs — Class 14.9 Fasteners
Why is hydrogen embrittlement such a critical concern at this strength?
When steel reaches 1400 MPa tensile strength, it is essentially "operating at its limit." Any hydrogen atoms trapped in the molecular structure can migrate to stress-concentrated areas, causing internal pressure that shatters the bonds between iron atoms. This results in the bolt snapping without warning. At the 14.9 grade level, stringent post-plating baking processes are mandatory to "drive out" this hydrogen.
How does Class 14.9 compare to the standard Class 12.9?
Class 12.9 is a high-strength fastener, while 14.9 is an ultra-high-strength fastener. Moving from 12.9 to 14.9 allows designers to use smaller diameter bolts to carry the same structural load—a key benefit in modern aerospace and high-performance automotive designs where weight reduction is as important as raw strength.
Can these bolts be used in any environment?
No. Because of their extreme hardness (44-50 HRC), these fasteners are vulnerable to Stress Corrosion Cracking (SCC) if exposed to certain chemicals, particularly acidic environments or high-temperature steam. They are intended for dry, controlled, high-stress environments rather than corrosive or chemically active ones.