ASTM A194 GRADE 4 NUTS
ASTM A194 Grade 4 Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Carbon-Molybdenum Steel Heavy Hex Nuts (ASTM A194 Grade 4). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 4 MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for highly durable, Molybdenum-alloyed carbon steel nuts, engineered specifically for severe high-pressure and high-temperature conditions shipped from Ananka Fasteners Pvt Ltd.
- Full Traceability: Certified with TC No.: C112/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the crucial Molybdenum addition (0.20 - 0.30%) which grants Grade 4 nuts superior creep strength and elevated temperature stability compared to standard carbon steel.
- Mechanical & Proof Load Testing: Comprehensive reporting of critical fastener metrics, validating the nut's Proof Load capability (min 1034 MPa / 150,000 psi) to resist thread stripping under immense stress.
- Heat Treatment Tracking: Verifies the necessary quenching and tempering (minimum 850°F / 455°C) required to maximize the alloy's structural advantages and maintain surface Hardness (24 to 35 HRC).
- Quality Compliance: 100% visual and dimensional inspection carried out to guarantee perfectly formed threads and flat bearing surfaces.
Live Preview: ASTM A194 Grade 4 Data
Review the standard parameters and layout before downloading the full document.
TC Number
C112/26-XX
TC Date
20.10.20XX
Material Spec
ASTM A194 GRADE 4
Nut Shape / Size
Heavy Hex Nut / M20
Dimensions / Item
Heavy Hex Nut M20-2.5P
Quantity
300.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Mo |
|---|---|---|---|---|---|
| 0.45 | 0.81 | 0.018 | 0.015 | 0.26 | 0.24 |
| Min: 0.40 Max: 0.50 |
Min: 0.70 Max: 0.90 |
Max: 0.040 | Max: 0.050 | Min: 0.15 Max: 0.35 |
Min: 0.20 Max: 0.30 |
Mechanical Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HRC) |
|---|---|
| 1088.50 | 28, 29, 28 |
| Min: 1034 | Min: 24 Max: 35 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for high-temperature pipeline and structural fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 4 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 performed. |
| Dimensional Accuracy | All dimensions, threads, and bearing surface tolerances conform to ASME B18.2.2. |
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
- Quenched & Tempered
- Tempering Temperature: Min 850°F (455°C)
Testing Conditions
- Proof load & hardness testing carried at room temperature 25°C
- 100% visual inspection carried out
Technical FAQs — ASTM A194 Grade 4 MTC Certificate
How does Grade 4 differ from Grade 2H?
While Grade 2H and Grade 4 share the same Proof Load and Hardness requirements, the chemistry is fundamentally different. Grade 4 contains a strategic addition of Molybdenum (0.20 - 0.30%). This alloying element significantly enhances the steel's hardenability, creep resistance, and overall strength retention at much higher operating temperatures than standard carbon steel.
What heat treatment methodology is tracked on this certificate?
The MTC logs a Quench and Temper phase. ASTM A194 requires that Grade 4 nuts be reheated above their critical temperature, quenched in a liquid medium, and then tempered at a minimum temperature of 850°F (455°C). This process leverages the Molybdenum content to lock in superior tensile properties.
Why does the certificate highlight Proof Load rather than Tensile Strength?
Nuts are internally threaded fasteners, meaning their primary failure mode is thread stripping rather than breaking like a bolt. Therefore, standard compliance focuses on Proof Load Stress—the specific axial load the nut can support without experiencing permanent thread deformation. For Grade 4, this is rigorously tested and logged at 150,000 psi (1034 MPa).