ASTM A194 GRADE 3
ASTM A194 Grade 3 Nuts Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Medium-Alloy Ferritic/Martensitic Fasteners (ASTM A194 Grade 3 / AISI 501). Review the verified chemistry, rigorous structural tests, and quenching heat treatment parameters necessary for high-temperature refineries and aggressive refinery environments.
What's Inside This A194 Grade 3 MTC Certificate
This sample mill test certificate mirrors the thorough quality compliance standard for 5% Chromium, Molybdenum-bearing alloy heavy hex nuts shipped for severe service allocations globally.
- Full Traceability: Certified under TC No.: S29/26-XX, mapped to an explicit heat number lot to guarantee complete raw material validation.
- 5% Chromium Chemistry: Breakdown confirming the standard Chromium range (4.00-6.00%) joined with Molybdenum (0.40-0.65%), providing critical high-temperature hydrogen resistance and protection from sulfur corrosion.
- Verified Thermal Processing: Verification logs showing liquid quenching followed by tempering above 565°C to stabilize the grain matrices against thermal breakdown.
- Mechanical Performance boundaries: Clear reporting of standard Brinell testing metrics within the strict 248 to 352 HBW window to prevent micro-fissures or thread stripping under high preload parameters.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A194 Grade 3 MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S29/26-XX
TC Date
17.04.20XX
Material Spec
ASTM A194 Grade 3 (AISI 501 Typ.)
Nut Profile / Size
Heavy Hex Nut / M22
Dimensions / Item
Heavy Hex Nut M22 x 2.5P
Quantity
450.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Mo | Fe |
|---|---|---|---|---|---|---|---|
| 0.13 | 0.45 | 0.020 | 0.014 | 0.35 | 5.10 | 0.52 | Rem |
| Min: 0.10 max | Max: 1.00 | Max: 0.040 | Max: 0.030 | Max: 1.00 | Min: 4.00 Max: 6.00 |
Min: 0.40 Max: 0.65 |
Rem |
Mechanical & Hardness Properties
| BRINELL HARDNESS (HBW) | ROCKWELL HARDNESS (HRC) | PROOF LOAD STRESS (MPa) |
|---|---|---|
| 268 | 27 | 1045 |
| Min: 248 Max: 352 |
Min: 24 Max: 38 |
Min: 1030 (Heavy Hex Layout) |
Standard References & Compliance
Our microstructural evaluation guarantees flawless integration within high-pressure piping assemblies. Finished nut walls check out perfectly with no scaling or micro-fracturing detected.
| 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 thread clearances verified against ASME B18.2.2 criteria. |
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 Certified
- Free from radioactive contamination
- Certified ISO 9001: 2015 Operation
Heat Treatments
- Liquid Quenched above 845°C (1550°F)
- Tempered above a minimum of 565°C (1050°F)
Testing Conditions
- Structural proof load validated at 25°C
- Complete thread axis checking performed
Technical FAQs — ASTM A194 Grade 3 MTC Certificate
What metallurgical advantages does ASTM A194 Grade 3 provide over standard carbon steel nuts?
ASTM A194 Grade 3 nuts are manufactured from a nominal 5% Chromium, 0.5% Molybdenum alloy steel (frequently grouped under AISI 501 chemistry criteria). The inclusion of Chromium dramatically enhances corrosion resistance against sulfur compounds and mitigates high-temperature oxidation, while Molybdenum provides excellent creep-rupture strength at service levels reaching up to 593°C (1100°F).
In which specific industrial networks are Grade 3 nuts implemented?
Due to its high resistance to hydrogen attack and high-temperature sulfidation, Grade 3 is highly sought after in petrochemical refineries, chemical processing units, and high-temperature steam generation piping systems. They are typically combined with ASTM A193 Grade B5 or B16 stud bolts to manage high-pressure flange joints securely.
What are the mandatory Brinell and Rockwell hardness scales certified under this standard?
Under ASTM A194 Grade 3 guidelines, the material must display a uniform hardness performance between 248 and 352 HBW. This equates roughly to a Rockwell rating of 24 to 38 HRC, giving the nut threads the exact balance of elastic yield and structural rigidity needed to prevent joint loosening under intense thermal cycles.