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Home / Products / Butt Weld Fittings / NACE MR0103 ISO 17345:2015 Compliant High Pressure Steel Tee for Sour Service with Controlled Chemical Composition
quality NACE MR0103 ISO 17345:2015 Compliant High Pressure Steel Tee for Sour Service with Controlled Chemical Composition factory
quality NACE MR0103 ISO 17345:2015 Compliant High Pressure Steel Tee for Sour Service with Controlled Chemical Composition factory
quality NACE MR0103 ISO 17345:2015 Compliant High Pressure Steel Tee for Sour Service with Controlled Chemical Composition factory

NACE MR0103 ISO 17345:2015 Compliant High Pressure Steel Tee for Sour Service with Controlled Chemical Composition

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butt weld connection

butt weld tube fittings

butt weld steel pipe fittings
Product Summary
NACE MR0103 / ISO 17345:2015 compliant high pressure steel tee designed for refinery sour service. Meets strict chemical composition limits in sections 13.1 & 15 for enhanced sulfide stress cracking resistance, with controlled S, P, and alloying elements to ensure durability in corrosive H₂S environments.

Product Details

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NACE MR0103 Compliant High Pressure Steel Tee

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Sour Service Resistant Butt Weld Tee

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Chemical Composition Controlled Steel Pipe Fitting
Product Description
NACE MR0103 / ISO 17345:2015 High Pressure Steel Tee
NACE MR0103 / ISO 17345:2015 establishes comprehensive requirements for metallic materials used in petroleum refining environments containing wet H₂S (sour service). The standard focuses on reducing risks of sulfide stress cracking (SSC), stress corrosion cracking (SCC), and related damage mechanisms through strict controls on material properties, chemical composition, heat treatment, and manufacturing processes.
Standard Overview
This international standard combines corrosion-resistance requirements, mechanical properties, and chemical composition limits specifically designed for refinery sour service applications. Chemical composition controls are particularly critical as they directly influence microstructure, hardness, and crack resistance.
Chemical Composition Requirements
The standard provides detailed requirements for each material category including carbon steels, low-alloy steels, stainless steels, and nickel-base alloys:
  • Nominal composition ranges for alloying elements (Cr, Ni, Mo, Cu, etc.)
  • Maximum limits for harmful elements (S, P, and residuals like Sn, Sb, As, Pb)
  • Additional restrictions for phase balance control in duplex stainless steels
Section 13.1 Interpretation
Section 13.1 establishes the fundamental principle that material chemical composition must comply with both the applicable base material standard (ASTM A182, A240, A350, etc.) and any supplementary restrictions specified in NACE MR0103 / ISO 17345:2015 for sour service. When conflicts occur between standards, the more restrictive limit applies.
Practical Application: Standard grade chemistry alone is insufficient for sour service. Mill test reports must demonstrate that actual heat analysis meets both base standard and NACE/ISO 17345 sour-service limits.
Section 15 Requirements
Section 15 contains detailed composition tables and specific controls for permitted alloy families, focusing on:
  • Carbon, Sulfur, and Phosphorus: Typically restricted to lower values than generic standards (e.g., S ≤ 0.010-0.015%, P ≤ 0.020-0.025%)
  • Alloying Elements: Minimum levels for Cr, Mo, Ni to ensure corrosion resistance and SCC resistance
  • Phase Balance: Composition limits for duplex stainless steels to achieve proper austenite/ferrite balance
  • Residual Elements: Upper limits on Cu, Co, Sn, Sb, As, Pb to prevent hot cracking and corrosion issues
Compliance Implementation Process
Step 1: Identify the material specification (e.g., ASTM A312 TP316L)
Step 2: Review base standard composition requirements
Step 3: Compare with NACE MR0103 / ISO 17345 Section 15 requirements
Step 4: Apply Section 13.1 logic - use the most restrictive limits
Step 5: Verify documentation and testing compliance
Common Compliance Pitfalls
  • Assuming standard 316L or 304L automatically meets NACE requirements
  • Overlooking product form differences (plate, bar, forgings, castings)
  • Ignoring weld filler metal composition requirements
  • Not considering service severity and environmental conditions
Project-Specific Review
For specific material qualification, obtain the official standard text, compare actual heat composition against applicable limits element-by-element, and confirm compliance with all special notes and service category requirements. Proper documentation and verification are essential for sour service applications.

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