General Introduction
-
- Introduction to NACE Material Requirements Standards
- History of MR0175 development
- Overview of MR0175/ISO 15156 Parts 1, 2, and 3, MR0103, TM0177, TM0284, and how they work together.
NACE MR0175/ISO 15156 Part 1
-
- Overview of Part 1 - General Principles for Selection of Cracking-Resistant Materials
- Evaluation of definition of service conditions
- Listed (pre-qualified) materials
Introduction to Carbon and Alloy Steel Metallurgy
-
- Introduction to carbon steel metallurgy, including terms and definitions in ASTM A941
- Using the Fe-Fe3C phase diagram in practical terms
- Using continuous cooling transformation diagrams to predict undesirable steel conditions for sour service
- Common heat treatments for carbon and alloy steels
- Classification of steels - UNS, ASTM, ASME, SAE (AISI), API, EN, and how they are used within NACE MR0175/ISO 15156
-
- Detailed discussion of the misnomers and slang terms used to described steels
- Review of several commonly used ASTM steel standards, such as A105, A106, A333, A516, and others
- Chemical compositions
- Mechanical properties
- Heat treatments
- Hardness requirements
- Supplementary requirements
- Material test reports
- Review of sample A105, A106, A333, and A516 material test reports
- Understanding the importance of material test report data and evaluation for meeting NACE MR0175/ISO 15156 and MR0103
- Using material test reports to make critical purchasing decisions
- Brief introduction to the weldability of carbon and alloy steels for wet H2S service
- Defining the weld in metallurgical terms
- Understanding the weld heat affected zones (HAZs)
- Use of carbon equivalence formulas
H2S Related Damage Mechanisms
-
- Introduction to H2S cracking mechanisms addressed in NACE MR0175/ISO 15156
- Sulfide stress cracking, stress corrosion cracking, hydrogen-induced cracking
- Stepwise cracking, stress-oriented hydrogen induced cracking, soft zone cracking and galvanically induced hydrogen stress cracking
- Description of affected materials, critical factors, affected units or equipment appearance
- Morphology of damage, prevention/mitigation, inspection and monitoring
NACE MR0175/ISO 15156 Part 2
-
- Qualification and selection of carbon and alloy steels for sour service
- Defining sour service environment (H2S partial pressure vs. pH)
- Regions of environmental sensitivity (Figure 1 in MR0175/ISO 15156 Part 2)
- Determination of H2S partial pressure and pH (Annex C and D)
- Overview of Annex A
- SSC-resistant carbon and alloy steels
-
- Maximum acceptable hardness values
- Applications to specific product forms (pipe, plate, fittings, bolting, etc.)
- Purchasing Materials for Sour Service
- Information to be supplied for material purchasing (Part 2 Annex E)
- Material test reports (MTRs) - what they really mean and how they should be used to qualify and purchase steels within MR0175/ISO 15156
Hardness Test Methods and Related ASTM and ISO Standards
-
- Bench hardness testing
- ASTM E10 and ISO 6506-1 (Brinell)
- ASTM E18 and ISO 6508-1 (Rockwell)
- ASTM E384 and ISO 6507-1 (Vickers)
- ASTM E110 (Portable Hardness Testers)
- ASTM E384 (Microindentation)
- Portable hardness testing:
- A833 (Telebrineller)
- A956 (Leeb, Equotip, others)
- A1038 (Microdur - MIC)
- Converting hardness test values to other scales: ASTM E140 and EN ISO 18265
NACE MR0175/ISO 15156 Part 3
-
- Part 3 and CRAs will not be covered in this course
NACE Test Methods for Sour Service
-
- Overview of NACE TM0177 and TM0284
- SCC laboratory testing for sour service (Part 2 Tables B.1, B.2, and B.3)
- Example test reports and applications of both test methods will be discussed
CSA and API Codes
-
- Review of sour service requirements for pipeline steels covered in CSA Z662 and API 5L specifications
NACE MR0103
-
- Roadmap to MR0103 (Table 1)
- Carbon, alloy, and stainless steel material requirements, including P-No. hardness
- Nonferrous material requirements
- Fabrication requirements (welding, cladding, stamping, threading)
- Bolting requirements
- Plating, coating and diffusion processes
- Special component requirements (bearings, springs, instrumentation, etc.)
- Valve requirements
- Compressor and pump requirements
Limitations of MR0175/ISO 15156 and MR0103
-
-
- Discussion of why hardness testing, laboratory testing, and NACE MR0175/ISO 15156 may not be sufficient to predict suitable application of materials for the intended sour service conditions