ASTM A194 GRADE 8R NUTS
ASTM A194 Grade 8R Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for High-Ductility, Copper-Modified Austenitic Stainless Steel Fasteners (ASTM A194 Grade 8R / UNS S30430 / AISI 304Cu). Verify chemical lattices, solution heat treatment variables, and mechanical compliance parameters certified for severe heading and critical chemical systems.
What's Inside This A194 Grade 8R MTC Certificate
This sample mill test certificate mirrors the thorough quality verification package standard for solution-treated copper-bearing stainless steel heavy hex nuts shipped from our facility to satisfy severe structural cold forming parameters.
- Full Traceability: Certified under tracking index TC No.: S35/26-XX, fully correlated with verified mill heat numbers to guarantee continuous material verification.
- Copper-Modified Austenitic Chemistry: Detailed chemical analysis displaying the accurate blend of Copper (3.00-4.00%) paired with Chromium (17.00-19.00%) and Nickel (8.00-10.50%), which substantially reduces the alloy work-hardening rate.
- Galling & Wear Control: The addition of copper enhances deep anti-frictional boundaries and decreases threat seizing tendencies under intense joint stresses.
- Thermal Condition Tracking: Explicit reporting confirming standard solution annealing variables and swift water quenching parameters to retain all carbon uniformly inside the solid matrix.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 8R MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S35/26-XX
TC Date
14.11.20XX
Material Spec
ASTM A194 Grade 8R (UNS S30430 Basis)
Nut Profile / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20 x 2.5P
Quantity
500.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | Cu | Fe |
|---|---|---|---|---|---|---|---|---|
| 0.055 | 1.62 | 0.034 | 0.009 | 0.52 | 17.80 | 8.70 | 3.45 | Rem |
| Max: 0.080 | Max: 2.000 | Max: 0.045 | Max: 0.030 | Max: 1.000 | Min: 17.00 Max: 19.00 |
Min: 8.00 Max: 10.50 |
Min: 3.00 Max: 4.00 |
Rem |
Mechanical & Hardness Properties
| BRINELL HARDNESS (HBW) | ROCKWELL HARDNESS (HRB) | PROOF LOAD STRESS (MPa) |
|---|---|---|
| 168 | 85 | 520 |
| Max: 233 | Max: 95 | Min: 515 (Heavy Hex Structural Framework) |
Standard References & Compliance
Our material quality matrices correlate perfectly with high-vibration power generation assemblies, valve internals, and wear-critical oil and gas piping boundaries. Surface testing concludes 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 against standard 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 Compliance
- Free from radioactive contamination
- Certified ISO 9001: 2015 Operation
Heat Treatments
- Solution Treated
- Liquid Quenched to achieve optimal carbide dispersion
Testing Conditions
- Hardness limits and proof load tracked at 25°C
- 100% thread clearance testing performed
Technical FAQs — ASTM A194 Grade 8R MTC Certificate
What metallurgical properties make ASTM A194 Grade 8R nuts uniquely ductile?
ASTM A194 Grade 8R heavy hex nuts are formulated from a copper-modified variant of austenitic stainless steel (UNS S30430, matching AISI 304Cu). Incorporating 3.00% to 4.00% Copper fundamentally lowers the material's work-hardening rate. This provides exceptional cold ductility and extreme fracture toughness, which helps minimize micro-fissuring during intense structural cold-heading or thread-forming cycles.
What differentiates Grade 8R from Grade 8RA fasteners under standard compliance frameworks?
Both grades leverage the exact same chemical formulation base (AISI 304Cu / UNS S30430). However, under ASTM A194 guidelines, Grade 8R parameters require solution heat treatment on the stock or blanks prior to standard final machining. Grade 8RA requires that the final solution annealing thermal treatment be completely executed *after* the heavy hex nuts have been fully machined and thread-tapped, entirely resetting any localized stresses introduced by tapping tools.
Why does this product specification strictly cap the maximum hardness at 233 HBW?
Capping the hardness at 233 HBW (95 HRB on the Rockwell B scale) provides definitive quality verification that the material stays in its homogeneous, solution-treated structural condition. Ensuring the alloy remains below this threshold preserves its un-stressed austenitic matrix state, which substantially minimizes thread galling or cold welding during high-torque assembly preloads.