ASTM A194 GRADE 8SA NUTS
ASTM A194 Grade 8SA Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Galling-Resistant Austenitic Stainless Steel Fasteners (ASTM A194 Grade 8SA / UNS S21800). Review the verified chemistry layouts, mechanical criteria, and custom post-machining Class 1A solution annealing tracking mapped for high-wear structural joints and severe process environments.
What's Inside This A194 Grade 8SA MTC Certificate
This sample mill test certificate mirrors the strict QA verification package required for Class 1A solution-annealed nitrogen-and-silicon-strengthened heavy hex nuts shipped from our facility to combat severe metal-to-metal friction parameters.
- Full Traceability: Issued under unique tracking index TC No.: S41/26-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 stresses are fully eliminated to maximize corrosion barriers.
- High-Silicon Manganese Chemistry: Detailed chemical analysis displaying the accurate blend of Silicon (3.50-4.50%) and Manganese (7.00-9.00%), which provides outstanding resistance to galling, wear, and cavitation compared to traditional stainless steel.
- Nitrogen Matrix Strengthening: Verification of precise Nitrogen composition (0.08-0.18%) which increases the underlying design yield point to nearly double that of standard AISI 304 elements.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 8SA MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S41/26-XX
TC Date
18.11.20XX
Material Spec
ASTM A194 Grade 8SA (UNS S21800 Class 1A)
Nut Profile / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20 x 2.5P
Quantity
400.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|
| 0.062 | 8.12 | 0.022 | 0.008 | 3.85 | 16.60 | 8.35 | 0.135 | Rem |
| Max: 0.10 | Min: 7.00 Max: 9.00 |
Max: 0.040 | Max: 0.030 | Min: 3.50 Max: 4.50 |
Min: 16.00 Max: 18.00 |
Min: 8.00 Max: 9.00 |
Min: 0.08 Max: 0.18 |
Rem |
Mechanical & Hardness Properties
| BRINELL HARDNESS (HBW) | ROCKWELL HARDNESS (HRB) | PROOF LOAD STRESS (MPa) |
|---|---|---|
| 185 | 90 | 530 |
| Max: 233 | Max: 95 | Min: 515 (Heavy Hex Structural Framework) |
Standard References & Compliance
Our material quality records match structural boundaries required by maritime infrastructure, aerospace assemblies, and high-frequency vibrating equipment. 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 homogeneous austenite distribution
Testing Conditions
- Hardness limits and proof load tracked at 25°C
- 100% thread clearance testing performed
Technical FAQs — ASTM A194 Grade 8SA MTC Certificate
What metallurgical properties make ASTM A194 Grade 8SA nuts uniquely galling-resistant?
ASTM A194 Grade 8SA nuts are based on a specialized super austenitic alloy (UNS S21800, commonly known as Nitronic 60). Integrating a high concentration of Silicon (3.50% to 4.50%) and Manganese (7.00% to 9.00%) creates a crystal matrix that minimizes wear, cold welding, and thread adhesion. This chemical formulation allows Grade 8SA fasteners to maintain friction parameters under high torque loads without matching or lubrication constraints.
What is the definitive purpose of the "A" suffix on Grade 8SA elements?
The "A" suffix designates Class 1A processing under ASTM A194 criteria. This means the heavy hex nuts are mandatory solution annealed *after* all final thread tapping, blank stamping, and machining steps are completed. Post-machining annealing fully relieves the severe localized stress matrices caused by cutting tools, maximizing structural ductility and optimizing resistance to environment-assisted corrosion cracking.
Why does the standard MTC enforce a strict maximum hardness cap of 233 HBW?
ASTM A194 limits Grade 8SA nut hardness to 233 Brinell (95 HRB Rockwell B) to serve as a quality checkpoint verifying that the Class 1A solution annealing process was completely successful. Keeping the material below this threshold preserves its optimized, un-stressed austenitic matrix form, preventing unexpected brittle cracks and reducing localized thread galling risks during high-torque assembly preloads.