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05 - 14 Steel Repairs

The document provides guidance on steel repairs for ships. It outlines various welding and repair procedures including: - Welding local defects with a maximum thickness tolerance of 5mm and 0.3mm and maximum welded area of 0.125m2. - Lamination repairs for plates over 1600mm wide for shell/strength deck and 800mm for other structural members. - Requirements for welding on hull plating below the water line including the use of low hydrogen electrodes and preheating material to 5°C minimum. - Comparable steel grades for normal and high strength structural steel including yield strength, tensile strength, elongation and temperature ranges.

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210 views1 page

05 - 14 Steel Repairs

The document provides guidance on steel repairs for ships. It outlines various welding and repair procedures including: - Welding local defects with a maximum thickness tolerance of 5mm and 0.3mm and maximum welded area of 0.125m2. - Lamination repairs for plates over 1600mm wide for shell/strength deck and 800mm for other structural members. - Requirements for welding on hull plating below the water line including the use of low hydrogen electrodes and preheating material to 5°C minimum. - Comparable steel grades for normal and high strength structural steel including yield strength, tensile strength, elongation and temperature ranges.

Uploaded by

maxuya2001
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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LLOYD’S REGISTER – FAIRPLAY SHIP REPAIR & MAINTENANCE HANDBOOK DOCUMENT: RM 5.

14
Company: Doc No: Form No : Page No : 1 Rev.No : Date :
Section : 5, Repairs Subject : STEEL REPAIRS Appr. by : Made by:

STEEL REPAIRS

Welding local defects: Maximum thickness tolerance for plates & wide flats:
5 mm = 0.3 mm
Max. welded area = 0.125 m²

Welding preparation: Thickness not be reduced to below 80% of original thickness, to be


verified by ultrasonic, magnetic particle, dye pen test

Lamination to be repaired by insert plates: Min. breadth of the plate to be repaired by insert:
1600 mm shell & strength deck plating i.w. of cruciform or T-joints
800 mm shell & strenght deck plating, primary members
600 mm other structural members

Weld spatters to be removed completely on: Shell plating; deck plating; tanks for chemical cargo, fresh water,
drinking water, lube oil, hydraulic oil

Welding on hull plating below water line: Low hydrogen electrodes to be used on normal & higher strength steel
Material to be preheated by torch to a minumum temperature of 5°C

Steel grades comparable to normal & high strength structural steel grades

Comparable steel grades


Grade Yield Tensile Elongation Temp. J, min. ISO EN ASTM JIS
Stress Strength L T 630-80 EN 10025-93
4950/2/3 EN 10113-93 A 131 G 3106
1981
A + 20 - - Fe 360 B S235JRG2 A SM41B
B 235 400-502 22 0 27 20 Fe 360 C S235JO B SM41B
D - 20 27 20 Fe 360 D S235J2G3 D SM41C
E - 40 27 20 - S275NL/ML E
A 27 0 Fe 430 C S275J0G3 - -
D 27 265 400-530 22 -20 27 20 Fe 430 D S275N/M - -
E 27 -40 - S275NL/ML - -
A 32 0 - - AH32 SM50B
D 32 315 440-590 22 -20 31 22 - - DH32 SM50C
E 32 -40 - - EH32 -
A 36 0 Fe 510 C S355N/M AH36 SM53B
D 36 355 490-620 21 -20 34 24 Fe 510 D S355N/M DH36 SM53C
E 36 -40 E 355 E S355NL/ML EH36 -
A 40 0 E 390 CC S420N/M AH40 SM58
D 40 390 510-650 20 -20 41 27 E 390 DD S420N/M DH40 -
E 40 -40 E 390 E S420NL/ML EH40 -

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