NORSOK M630 is a technical regulation standard for the Norwegian petroleum industry. Its full name is “Norwegian Petroleum Industry Technical Regulation Standard M630.”
The Norwegian Petroleum Standardization Organization (NORSOK) developed the standard to coordinate and reduce the number of oil company specifications, provide suitable technical and cost-effective solutions, and ensure that oil resources are best developed and managed.
The latest version of NORSOK M630 is the 2020 edition, which replaces the Rev.6 version from 2013. This version makes several changes to the material data sheet, including alignment with the International Organization for Standardization (ISO) and ASME standards to ensure compatibility and consistency in the global market.
Historical background and formulation organization
The development of NORSOK standards began in 1993, when the Norwegian petroleum industry established the Norwegian Petroleum Standardization Organization (NORSOK) to coordinate industry specifications through the development of standards and reduce project execution time and operating costs.
NORSOK standards are managed and published by the Norwegian Oil and Gas Association (OLF) and the Norwegian Shipowners Association (TBL), and the Norwegian Technical Center (NTS) is responsible for administration and publication.
Main content and application areas
The NORSOK M630 standard mainly involves the specifications of material data sheets (MDSS), including destructive quality testing requirements for duplex stainless steel, unification of material data sheets, and sulfur-containing service requirements in accordance with ISO 15156. These standards apply to material data sheets for carbon and low-alloy steels and are intended to ensure the safety and applicability of materials.
NORSOK M-630:2020 Material data sheets and element data sheets for piping
This document specifies additional material requirements in a collection of material data sheets and element data sheets for use in piping systems designed according to ASME B31.3 for normal and high-pressure service.
MDS Numbering System
General
The MDS number consists of one or two letters and two digits followed by a one or two letter code.
The 1st letter is a code for the relevant material type as follows:
C – carbon steels: Type 235, Type 235LT, Type 360LT;
D – ferritic/austenitic stainless steels: Type 22Cr, Type 25Cr;
K – copper/nickel 90/10 and other copper alloys;
N – nickel base alloys;
P – polymers including fibre reinforced;
R – austenitic stainless steels: Type 6Mo, Type 565;
S – austenitic stainless steels: Type 316;
T – titanium;
X – low alloyed steels.
If there is a 2nd letter this represents the following coding:
H – these MDSs are prepared in compliance with ASME B31.3 Chapter IX High Pressure.
NOTE The H-MDSs are considered compliant with ISO 13628-15 and suitable for subsea applications.
Carbon steel (C-series)
MDSs for carbon steel have a two-digit number with the following coding.
The first digit:
3: non-impact tested carbon steel for ambient and high temperature use (Type 235);
4: impact tested carbon steel for low temperature use (Type 235LT);
5: high strength impact tested CMn-steel for low temperature use (Type 360LT);
6: extra high strength CMn-steel/low alloyed steels for low temperature use (HSLA).
The last digit is a product code as follows:
0: various/miscellaneous;
1: seamless pipe;
2: welded pipe;
3: wrought fitting;
4: forging;
5: plate;
6: casting;
7: bar;
8: tube;
9: various/miscellaneous.
Any letters after the two digits identify suffixes related to sour service given in the respective MDSs as follows:
S: sour service;
SH: sour service including HIC and ultrasonic testing applicable to flat rolled products.
NOTE Material data sheets designated with supplementary suffix “S” or “SH” also satisfy all the MDS requirements for general, non-sour service.
EXAMPLE 1 MDS C33 designates carbon steel fittings for general, non-sour service, as opposed to C33S which designates carbon steel fittings which also comply with the additional supplementary requirements for sour service, excluding HIC testing.
EXAMPLE 2 MDS C33SH designates carbon steel fittings complying with the additional supplementary requirements for sour service plus HIC and UT testing, where applicable.
Stainless steels (D- and R-series)
MDSs for duplex stainless steel (D-series), and high austenitic stainless steel (R-series) have the same product coding as specified above for parts in carbon steels is applied.
Any suffix letters after the digits identifies as follows:
L: extra low temperature and CVN testing @ -101 °C.
Austenitic Stainless steels (S-series)
For austenitic stainless steel (S-series) the following coding is applied for the first digit:
1: Alloy 316;
3: Precipitation hardened austenitic stainless steel.
The 2nd digit represents the same product coding as specified above for parts in carbon steels or the letter “A” for additive manufactured products.
Non-ferrous alloys
MDSs for CuNi-alloys (K-series), nickel alloys (N-series) and titanium Grade 2 (T-series) have a two digit coding.
For CuNi-alloys (K-series), nickel alloys (N-series) and titanium Grade 2, the first digit represents the applicable alloy as shown below.
Copper base alloys; K-series:
1: CuNi 90/10 UNS C70600 and C95800.
Nickel base alloy N-series:
1: Alloy 625 (UNS N06625);
2: Alloy 718 (UNS N07718).
Titanium base alloys, T-series:
2: Grade 2.
For all the above listed materials the 2nd digit is the product code as for carbon steels (C-series) or the letter “A” for additive manufactured products.
Low alloy steel
For low alloy steel (X-serie) the following coding is applied for the first digit:
1: Alloy AISI 4130 and CMnMo casting;
2: Alloy AISI 4140;
3: Grade F22 or Grade 22.
Referenced standards (ASTM and API/ISO) and corresponding MDS
The MDSs established for piping systems designed to ASME B31.3 Normal service are listed in Table and the MDSs are collected in Annex A. Similar the MDSs established for piping systems designed to ASME B31.3 Chapter IX High Pressure Service are listed in Table 3 and the MDSs are collected in Annex B.
Table – List of MDSs compliant with ASME B31.3 Normal Service
Common Material Types
- Norsok MDS D44 A182 Grade F51, F60 Forgings
- Norsok MDS D45 A240 UNS S31803, UNS S2205 Plates
- Norsok MDS D47 A276/A479 UNS S31803, UNS S32205 Bars
