ASTM A193 GRADE B7M – MTC
ASTM A193 Grade B7M Sample MTC Certificate
Access a comprehensive, professionally formatted Material Test Certificate according to EN 10204-2004: 3.1 for Alloy Steel Grade B7M (ASTM A193). Inspect the exact documentation your QA and engineering teams will receive with every Ananka Fasteners order, verifying suitability for sour gas and high-pressure environments.
What's Inside This A193 B7M MTC Certificate
This sample mill test certificate mirrors the rigorous QA documentation package standard for Chromium-Molybdenum alloy steel bolting shipped from Ananka Fasteners Pvt Ltd, specifically manufactured for H2S-containing environments.
- Full Traceability: Certified with TC No.: S74/26-XX and strictly adhering to ASTM A193 Grade B7M specifications.
- Verified Alloy Chemistry: Detailed breakdowns verifying the Chromium (0.75-1.20%) and Molybdenum (0.15-0.25%) content, which provides the necessary high-temperature strength and hardenability.
- Strict Hardness Limits: Explicit testing confirming the hardness does not exceed 99 HRB (or 235 HBW). This lower hardness limit is critical for preventing sulfide stress cracking (SSC) in sour gas service per NACE MR0175.
- Mechanical Properties: Comprehensive reporting of Tensile Strength (min 690 MPa), Yield Strength (min 550 MPa), Elongation, and 100% hardness validation.
- Quality Compliance: 100% visual inspection carried out and verified free from defects and radioactive contamination.
Live Preview: ASTM A193 Grade B7M MTC Data
Review the standard parameters and layout before downloading the full document.
TC Number
S74/26-XX
TC Date
23.06.20XX
Material Spec
ASTM A193 GRADE B7M
Bar Shape / Size
Round Bar / 16 mm
Dimensions / Item
Stud Bolt M16-2.0 x 80 mm
Quantity
100.00 NOS
Chemical Composition %
| C | Mn | P | S | Si | Cr | Mo | Fe |
|---|---|---|---|---|---|---|---|
| 0.41 | 0.85 | 0.015 | 0.010 | 0.25 | 0.95 | 0.20 | Rem |
| 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 |
Rem |
Mechanical Properties
| TENSILE STRENGTH (Mpa) | YIELD STRENGTH 0.2% Offset (Mpa) | % ELONGATION (GL-50mm) | HARDNESS (HRB) |
|---|---|---|---|
| 750.50 | 610.20 | 22.50 | 92, 94, 91 |
| Min: 690 | Min: 550 | Min: 18 | Max: 99 |
Standard References & Compliance
Our MTC certificates map to the demanding industrial standards for fasteners in severe environments. The test reports confirm compliance with As Per ASME/ASTM A193 Grade B7M EDT. 20XX 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 Perform. |
| Dimensional Accuracy | All Dimensions are as per PO Specification. |
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 and Tempered
- Minimum Tempering Temp: 1150°F (620°C)
Testing Conditions
- 100% Hardness testing performed per batch
- Chemical & Mechanical tests carried at room temperature
Technical FAQs — ASTM A193 B7M MTC Certificate
Why is B7M specified instead of standard B7?
Grade B7M is chemically identical to standard Grade B7 (both are AISI 4140/4142 alloy steel). However, B7M is tempered at a higher minimum temperature to achieve lower mechanical strength and a strictly controlled lower hardness limit. This specific treatment prevents Sulfide Stress Cracking (SSC) in "sour gas" (hydrogen sulfide, H2S) environments, making it fully compliant with NACE MR0175 standards.
Why is the maximum hardness limit (99 HRB) so critical on this MTC?
In sour gas applications, steel that is too hard is highly susceptible to sudden, brittle failure known as stress corrosion cracking. To conform to ASTM A193 B7M and NACE MR0175, the MTC must prove that the material's hardness does not exceed 235 HBW or 99 HRB. Unlike many other grades, B7M requires 100% hardness testing of every single fastener in a lot to ensure this limit is never breached.
What heat treatment methodology is tracked on this certificate?
The MTC records a "Quenched and Tempered" heat treatment. Crucially for Grade B7M, the tempering process must be performed at a minimum of 1150°F (620°C). This higher tempering temperature is what differentiates its mechanical properties from standard B7, safely reducing the strength and hardness to acceptable limits for volatile environments.