Norsok M-630 D59, Strain Hardened UNS 32760S Super Duplex

Learn more about the forms, sizes, and properties of our Norsok M-630 D59 products below.

Description of Material

Lonestar Fasteners Europe supply strain hardened duplex to various international and Original Equipment Manufacturers specific standards including but not limited to VN606 and Norsok M-630 D59 material. Material can be supplied with impact results at -46 degree @35 joules to meet the basic requirement of M630 D59, or 27 Joules @ -101 to meet the mechanical requirements of A320 L7 (known as FLT condition).

As a qualified Norsok M650 D60 Ed4 accredited manufacturer, Lonestar Fasteners Europe have demonstrated that they can consistently supply strain hardened 32760 duplex studs (supplied with solution annealed nuts) to the world’s leading projects, utilising the leading steel mills through a controlled and fully audited supply restricted supply chain and method of manufacture.

Norsok M-630 D59: Forms

  LoneStar Manufacture 
Stud Bolts
Double Ended Studs

Norsok M-630 D59: Sizes and Threads 

  LoneStar Manufacture 
Metric Coarse
Metric Fine
Imperial UNC
Imperial 8UN
Imperial UNF
Metric sizes available Up to M90
Imperial sizes available Up to 3.5″

Norsok M-630 D59: Chemical Composition

Carbon 0.03 % Max 
Manganese 1.00 % Max
Phosphorus 0.030 % Max
Sulphur 0.010 % Max
Silicon 1.00 % Max
Chromium 24.0-26.0 %
Nickel 6.0-8.0 %
Molybdenum 3.0-4.0 %
Copper 0.50-1.00 %
Niobium 0.20-0.30 %

Norsok M-630 D59: Mechanical Properties

Up to 3 ½” Inc.
Tensile Strength Min, MPa 860
Yield Strength min, 0.2% offset MPa 725
Elongation min% 16
Reduction of Area min%
Hardness, max 35 HRC
Hardness, max 335 HB

Norsok M-630 D59: Impact Properties

Up to 3 ½” Inc.
Test Temperature, °C -46 -110
Acceptance Criteria, Average min (J) 45 27 Joules
Acceptance Criteria, Single, min (J) 35


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