ASTM A194 GRADE 7L & 7ML NUTS
ASTM A194 Grade 7L & 7ML Nuts Sample MTC
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Alloy Steel Heavy Hex Nuts designed for severe conditions (ASTM A194 Grade 7L and 7ML). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order.
What's Inside This A194 Gr 7L/7ML MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for high-strength alloy steel nuts required to perform reliably in sub-zero/cryogenic environments, as well as highly corrosive sour gas (H2S) applications.
- Full Traceability: Certified with TC No.: C162/26-XX and corresponding ASTM specifications.
- Material Chemistry: Explicitly details the Chromium-Molybdenum alloy foundation (AISI 4140 type), ensuring exceptional structural integrity under extreme stress and temperature fluctuations.
- Low-Temperature Toughness: The "L" signifies mandatory Charpy V-Notch impact testing at -101°C (-150°F), strictly documented to guarantee the material will not suffer catastrophic brittle fracture in extreme cold.
- Sour Service Compliance (7ML): For Grade 7ML, this document guarantees the maximum hardness does not exceed 235 HBW (22 HRC), fully complying with NACE MR0175 to mitigate Sulfide Stress Cracking (SSC).
- Mechanical & Proof Load Testing: Validates the nut's Proof Load capacity, recording min 1034 MPa for Grade 7L, and a controlled min 793 MPa for the softer, sour-service 7ML specification.
Live Preview: ASTM A194 Grade 7L & 7ML Data
Review the standard parameters and layout before downloading the full document.
TC Number
C162/26-XX
TC Date
10.09.20XX
Material Spec
ASTM A194 GRADE 7L / 7ML
Nut Shape / Size
Heavy Hex Nut / M24
Dimensions / Item
Heavy Hex Nut M24-3.0P
Quantity
300.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|
| 0.41 | 0.88 | 0.012 | 0.010 | 0.28 | 0.98 | 0.22 |
| Min: 0.37 Max: 0.49 |
Min: 0.65 Max: 1.10 |
Max: 0.035 | Max: 0.040 | Min: 0.15 Max: 0.35 |
Min: 0.75 Max: 1.20 |
Min: 0.15 Max: 0.25 |
Mechanical & Impact Properties
| PROOF LOAD STRESS (MPa) | HARDNESS (HBW) | IMPACT ENERGY @ -101°C (Joules) |
|---|---|---|
| 1045.00 (7L) / 810.00 (7ML) | 275 (7L) / 218 (7ML) | 45, 48, 42 |
| Min: 1034 (7L) Min: 793 (7ML) |
Min: 248 / Max: 352 (7L) Min: 159 / Max: 235 (7ML) |
Min: 27 Joules (20 ft-lbf) |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for low-temperature and sour environment pipeline fasteners. The test reports confirm compliance with As Per ASME/ASTM A194 Grade 7L & 7ML with respect to the tests carried out, noting rigorous Charpy impact verifications.
| Standard / Requirement | Confirmation on Certificate |
|---|---|
| Visual Inspection | 100% visual inspection carried out & found free from defects. |
| Low Temp Impact Testing | Charpy V-Notch testing conducted at -101°C (-150°F) per ASTM A320. |
| Sour Service (Grade 7ML) | Hardness verified max 22 HRC (235 HBW) complying with NACE MR0175 / ISO 15156. |
| 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
- NACE MR0175 Conformity (7ML)
- Certified ISO 9001: 2015 Company
Heat Treatments
- Quenched & Tempered
- Tempering Temp: Min 1100°F (7L) / Min 1150°F (7ML)
Testing Conditions
- 100% Hardness testing performed for 7ML batches
- Charpy Impact specimens cooled and tested at -101°C
Technical FAQs — ASTM A194 Grade 7L & 7ML MTC Certificate
What does the "L" signify in these grades?
The "L" indicates that the material is intended for Low-Temperature service. Standard alloy steel can become dangerously brittle in freezing conditions. Grades with the "L" designation are subjected to mandatory Charpy V-Notch impact testing at cryogenic temperatures (typically -101°C / -150°F) to guarantee they retain enough toughness to safely handle impact loads and pressure without cracking.
What is the key difference between Grade 7L and Grade 7ML?
Both require low-temperature impact testing. The difference lies in the "M", which stands for Modified for sour service. Grade 7ML is tempered at a higher temperature to strictly limit its maximum hardness to 235 HBW (22 HRC). This ensures compliance with NACE MR0175 for Hydrogen Sulfide (H2S) environments, preventing Sulfide Stress Cracking. Grade 7L is allowed to have a higher maximum hardness and proof load, but cannot be safely used in sour gas environments.
Why is 100% hardness testing mentioned for Grade 7ML?
Because the hardness limit is a critical safety factor in preventing sour gas cracking, ASTM A194 requires that 100% of Grade 7ML nuts be individually tested for hardness to ensure no single nut in the batch exceeds the 235 HBW / 22 HRC limit. Grade 7L, on the other hand, is usually tested on a statistical sampling basis.