ASTM A106 GR.B Carbon Steel SMLS Pipe SOUR SERVICE NACE MR0175
ASTM A106 PIPE, GRADE-B A106 COLD DRAWN SEAMLESS PIPES, A106 GR.B SEAMLESS LINE PIPES, ASME SA / ASTM A106 GR.B SEAMLESS CARBON STEEL PIPES AND TUBES STOCKIEST MANUFACTURER & EXPORTER
GR.B ASME SA 106 HIGH TEMPERATURE SEAMLESS PIPE DEALER, ASTM A106 CARBON STEEL GRADE B TUBING, A106 SEAMLESS PRESSURE PIPE, ASTM A106 CARBON STEEL SEAMLESS RECTANGULAR PIPE & TUBE MANUFACTURER & SUPPLIERS.
For sour service applications, A106 Gr.B SMLS pipes are manufactured and controlled to meet NACE MR0175 / ISO 15156 requirements to ensure resistance against sulfide stress cracking (SSC) in H₂S environments.
These ASME SA 106 Carbon Steel Grade B Tubes are thoroughly examined on numerous quality stages before final dispatch. Clients can avail from us high quality of ASME SA 106 Grade B Carbon Steel Pipes which is manufactured in our advanced manufacturing unit. We are as well engaged in trading and delivering superior quality of ASTM A106 Grade B Carbon Steel Pipes.
SOUR SERVICE:
Refers to service conditions containing hydrogen sulfide (H₂S) — typically found in oil & gas production environments. “Sour” means the presence of H₂S, which can cause sulfide stress cracking (SSC), hydrogen embrittlement, and corrosion.
NACE MR0175 (ISO 15156):
This is the international standard for materials used in H₂S-containing environments in oil and gas production.
-
It specifies requirements and material limits (chemical composition, hardness, heat treatment, microstructure) to ensure resistance to SSC and other corrosion mechanisms.
ASME SA / ASTM A106 GR.B Carbon Steel Seamless Pipes & Tubes Chemical Composition :
| Chemical Composition (%) | ||||||||||
| Grade | C(Max) | Mn | Si(Min) | Cu(Max) | Ni(Max) | Cr(Max) | Mo(Max) | V(Max) | P(Max) | S(Max) |
| B | 0.3 | 0.29~1.06 | 0.1 | 0.4 | 0.4 | 0.4 | 0.15 | 0.08 | 0.035 | 0.035 |
A 106 Grade B SMLS Pipes and Tubes Mechanical properties:
| Mechanical Properties: | ||
| Grade | Tensile Strength (Mpa), Min. | Yield Strength (Mpa), Min. |
| B | 415 | 240 |
Carbon Steel Seamless Pressure Pipes and Tubes Tolerance :
| NPS | 1/8″ to 1 1/2″ | Over 1 1/2″ to 4″ | Over 4″ to 8″ | Over 8″ to 18″ | Over 18″ to 26″ | Over 26″ to 34″ | Over 34″ to 48″ |
| OD Tolerance | +/- 0.4 | +/- 0.8 | +1.6, -0.8 | +2.4, -0.8 | +3.2, -0.8 | +4.0, -0.8 | +4.8, -0.8 |
| WT Tolerance | +/- 12.5% | ||||||
| Weight Tolerance | +10%, -3.5% | ||||||
Typical Requirement of ASTM A106 grade B pipes for Sour Service (H₂S) Requirements
To qualify as Sour Service pipe, additional conditions must be met:
-
Hardness controlled below NACE MR0175 limits.
- sulfur and phosphorus content are usually kept at the lower end of the range to improve SSC resistance.
-
Heat treatment: normalized or normalized + tempered.
-
Certified to NACE MR0175 / ISO 15156.
HIC Testing (Hydrogen Induced Cracking)
For critical sour service applications, pipes can be supplied with HIC (Hydrogen Induced Cracking) testing in accordance with:
-
NACE TM0284
-
NACE MR0175 / ISO 15156
HIC Test Conditions:
-
Test Solution: NACE Solution A (5% NaCl + 0.5% Acetic Acid)
-
Saturated with H₂S gas
-
Exposure Duration: 96 hours (or as specified)
Acceptance Criteria:
-
CLR (Crack Length Ratio) ≤ 15%
-
CTR (Crack Thickness Ratio) ≤ 5%
-
CSR (Crack Sensitivity Ratio) ≤ 2%
(Values adjustable per project requirement)
Material Requirements for Sour Service
Steelmaking Process
-
Fully killed steel
-
Basic oxygen furnace (BOF) or electric furnace (EAF) process
-
Fine grain practice
Sour Service Compliance
For H₂S-containing environments, pipes are supplied with:
-
Controlled sulfur content
-
Hardness limitation per NACE
-
Optional HIC / SSC testing
-
Full traceability
-
EN 10204 3.1 certification
-
Third-party inspection available
ASTM A106 Grade B Seamless Pipe is a carbon steel pipe used for high-temperature and high-pressure service.
When specified for sour service, the pipe is specially manufactured and heat-treated to meet NACE MR0175 / ISO 15156 requirements for H₂S-containing (sour) environments in oil, gas, and petrochemical industries.
