ASTM A194 GRADE 8RA NUTS
ASTM A194 Grade 8RA 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 8RA / UNS S30430 / AISI 304Cu). Review verified chemical matrices, solution annealing tracking parameters, and mechanical limits certified for severe cold-forming and critical environmental service configurations.
What's Inside This A194 Grade 8RA MTC Certificate
This sample mill test certificate mirrors the strict QA verification package required for Class 1A post-machining solution-annealed copper-bearing stainless steel heavy hex nuts shipped from our facility to satisfy severe structural deformation parameters.
- Full Traceability: Issued under unique tracking index TC No.: S39/26-XX, fully correlated with verified mill heat identifiers to guarantee continuous tracking parameters.
- Class 1A Solution Annealing: Explicit verification that components have undergone mandatory solution heat treatment after final tapping or forming operations, ensuring all residual manufacturing stresses are completely eliminated to maximize core corrosion barriers.
- 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 work-hardening rates and enhances processing elasticity.
- Galling & Hardness Control: Hardness values tracked closely below the maximum standard limit of 233 HBW (95 HRB Rockwell maximum) to preserve structural ductility and prevent thread galling under high preloads.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 8RA MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S39/26-XX
TC Date
19.11.20XX
Material Spec
ASTM A194 Grade 8RA (UNS S30430 Class 1A)
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 |
|---|---|---|---|---|---|---|---|---|
| 0.052 | 1.64 | 0.031 | 0.008 | 0.48 | 17.85 | 8.65 | 3.42 | 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) |
|---|---|---|
| 165 | 84 | 525 |
| Max: 233 | Max: 95 | Min: 515 (Heavy Hex Structural Framework) |
Standard References & Compliance
Our material quality records match structural boundaries required by maritime architecture, electronic assembly fixtures, and cold-headed industrial framing networks. The surfaces pass visual checks 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 stainless elements. |
| Dimensional Accuracy | All heavy hex sizing verified against 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
- Class 1A Solution Annealed (Post-Machining)
- Rapidly Quenched to secure uniform alloy distribution
Testing Conditions
- Hardness limits and proof load tracked at 25°C
- 100% thread clearance testing performed
Technical FAQs — ASTM A194 Grade 8RA MTC Certificate
What metallurgical benefit does the addition of Copper provide to Grade 8RA nuts?
ASTM A194 Grade 8RA 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 cold-heading, severe forming, or thread-forming cycles.
What is the technical significance of the "A" suffix within the Grade 8RA tracking context?
The "A" suffix designates a mandatory Class 1A processing condition under ASTM A194 specifications. This requires that the nuts undergo a full solution annealing thermal cycle *after* final cold heading, thread cutting, or tapping operations are completed. Post-machining annealing relieves severe residual cold work strains, softening the crystal matrix below critical thresholds to maximize elongation and protect against stress corrosion cracking (SCC).
Why does the 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 post-machining solution annealing cycle was completely successful. Ensuring the material remains below this threshold confirms a fully un-stressed austenitic matrix state, which substantially minimizes structural thread galling or cold welding during high-torque preload assembly.