Tomorrows Fastener Materials NKF Haugesund April 14 th 2016

Transcription

1 Tomorrows Fastener Materials NKF Haugesund April 14 th 2016

2 High temperature material (ASME) Carbon steel materials for high pressure + high temperature Bolt material Nut material Temp. range B7 2H -30 C to +538 C This combination of material is replaced with L7/Gr.7 - L7/Gr.7 has the same mechanical properties as B7/2H 2

3 Low/High temperature material (ASME) Carbon steel materials for high pressure + low/high temperature Bolt material Nut material Temp. range L7 Grade C to +538 C L43 L C to +538 C d 2½ (65mm) d 2½ (65mm) - Charpy-V test at 101 C with a impact energy absorption of at least 27 Joule. 3

4 Surface treatment used for Carbon Steel - Hot dip galvanizing - Imperial sizes / Unified - Bolts made with standard threads, Class 2A and nuts are oversize to fit with the bolt. - It is the manufacturers responsibility to ensure the functionality - Metric sizes - Bolt threads made in acc. to ISO az and nuts with standard 6H-thread - 6az fits in blind holes - PTFE (Xylan) - Coating thickness is typically microns - Thread must be adapted to the coating 4

5 L7/Gr. 7 with lot marking L7/Gr.7 stud bolts assembled with two nuts Lot marking with hard stamping or raised marking on stud and nuts Hot dip galvanized or plain surface Fully equipped and accredited test laboratory in house Material from European steel manufacturers only Documents with full traceability to product On stock in Bryne in a wide range of dimensions and lengths

6 3.1 certificate an example

7 Low/High temperature material (ASME) Stainless steel materials for high pressure + low/high temperature Bolt material Nut material Temp. range B8 Class I Grade C to +815 C B8 Class II Grade C to +538 C B8M Class II Grade 8M -200 C to 650 C Corresponds to property Class 50 Corresponds to property Class 70/80 Corresponds to property Class 70 - B8M is AISI type 316 steel similar to A4 material according to ISO PREN number B8: PREN number B8M:

8 Super duplex materials Material Tensile strength [MPa] Yield strength [MPa] Elongation D60 / VN % D57X / D % - Composition of austenitic and ferritic alloying elements - Good corrosion resistance - D60 is the primary bolting material for Johan Sverdrup - D57X/D59 has the same mechanical properties as L7, combined with the high corrosion resistance of duplex steel. - PREN number min. 40 Materials with PREN numbers above 32 are considered sea water resistant! 8

9 IML NORSOK M-650 ed. 4 approved Approved range in D60 / VN605 Rolled Super Duplex Stud bolts in range ½ 3 ½ Die forged Hexagon Heavy Nuts in range ½ 3 ½ Approved range in D59 Strain Hardened Super Duplex Stud bolts in range ½ 2 ½ Approved range in D54 / DF2xx Forged Fittings Threaded NPT, ⅛ -2, 6000 lbs Forged Fittings Socket Weldings, ⅛ -2, 9000 lbs Forged Olet and Sockolet, ½-2, 9000 lbs

10 SSF NORSOK M-650 ed. 4 approved Approved range in D60 Rolled Super Duplex Stud bolts in range ½ 3 ½ Machined Hexagon Heavy Nuts in range ½ 3 ½ Machined Hexagon Head Bolts in range ½ 3 ½ Die forged Hexagon Heavy Nuts in range 8 45 mm thread Die forged Hexagon Head Bolts in range 8 45 mm thread D59 approvals in process and expected finalized in May 2016 Strain Hardened Super Duplex Stud bolts in range ½ 2 ½

11 Inconel materials Material Temp. range Tensile strength [MPa] Yield strength [MPa] Inconel C C Inconel C C ~1200 ~1000 Good elongation High strength Very high nickel content expensive! PREN Inconel 625: 41 PREN Inconel 718: 27 Caution to be taken when using 718 due to massive increase in surface hardness if rolled threads are used. Values above 40 HRC have been seen. 11

12 Titanium materials Material Tensile strength [MPa] Yield strength [MPa] Titan grade Titan grade Very high corrosion resistance in sea water - Light weight - Non magnetic - External threads for grade 5 can be made by cutting only! 12

13 Leak proof installation Assembly Number of tools (difference) Use the appropriate tightening torque Lining op the assembly Use lubricant One tool 1. One round cross tightening with 30 % of given torque. 2. One round cross tightening with 60 % of given torque. 3. Two rounds cross tightening with 100 % of given torque. 4. Check all bolts with given torque. Two tools 1. One round cross tightening with 50 % of given torque. 2. Two rounds cross tightening with 100 % of given torque. 3. Check all bolts with given torque. Four tools 1. Tighten all bolts two times with the given torque. 2. Always perform the tightening in cross. 3. Check all bolts with given torque. 13

14 Leak proof installation After assembly - At least 1 free thread - Uniform distance between flange faces. 14

15 Leak proof installation Before assembly - Check gasket (Gasket deforms at assembly) - Stud bolt + nut of appropriate quality and length - Preferably with washer to secure uniformity in tightening Without washer With washer 15

16 Test Example UNS S

17 Friction test performed by Würth Industri Norge Determination of friction properties in any material combination Test based on blind flange material Multiple lubricants compared Customer examples where friction tests have been performed ConocoPhillips, D57X installed with flat washers Water Mist Engineering, D59 vs. Cr22/Cr25/Ti National Oilwell Vargo, 8.8U/10.9U Hot Dip Galvanized 17

18 MANY THANKS FOR YOUR ATTENTION 18