6.4 Requirements for metallic materials
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6.4 Requirements for metallic materials

  6.4.1 General requirements for metallic materials

  6.4.1.1 The requirements for materials of construction are shown in the tables as follows:

  • .1 Table 6.1: Plates, pipes (seamless and welded), sections and forgings for cargo tanks and process pressure vessels for design temperatures not lower than 0°C.

  • .2 Table 6.2: Plates, sections and forgings for cargo tanks, secondary barriers and process pressure vessels for design temperatures below 0°C and down to -55°C.

  • .3 Table 6.3: Plates, sections and forgings for cargo tanks, secondary barriers and process pressure vessels for design temperatures below -55°C and down to -165°C.

  • .4 Table 6.4: Pipes (seamless and welded), forgings and castings for cargo and process piping for design temperatures below 0°C and down to -165°C.

  • .5 Table 6.5: Plates and sections for hull structures required by 4.19.1.2 and 4.19.1.3.

PLATES, PIPES (SEAMLESS AND WELDED)footnote footnote, SECTIONS AND FORGINGS FOR CARGO TANKS AND PROCESS PRESSURE VESSELS FOR DESIGN TEMPERATURES NOT LOWER THAN 0°C
CHEMICAL COMPOSITION AND HEAT TREATMENT
♦ Carbon-manganese steel
♦ Fully killed fine grain steel
♦ Small additions of alloying elements by agreement with the Administration
♦ Composition limits to be approved by the Administration
♦ Normalized, or quenched and tempered footnote
TENSILE AND TOUGHNESS (IMPACT) TEST REQUIREMENTS
Sampling frequency
♦ Plates Each "piece" to be tested
♦ Sections and forgings Each "batch" to be tested.
Mechanical properties
♦ Tensile properties Specified minimum yield stress not to exceed 410 N/mm2 footnote
Toughness (Charpy V-notch test)
♦ Plates Transverse test pieces. Minimum average energy value (KV) 27J
♦ Sections and forgings Longitudinal test pieces. Minimum average energy (KV) 41J
♦ Test temperature Thickness t (mm) Test temperature (°C)
t≤20 0
20<t≤40 footnote -20
PLATES, SECTIONS AND FORGINGS footnote FOR CARGO TANKS, SECONDARY BARRIERS AND PROCESS PRESSURE VESSELS FOR DESIGN TEMPERATURES BELOW 0°C AND DOWN TO -55°C Maximum thickness 25 mm footnote
CHEMICAL COMPOSITION AND HEAT TREATMENT
♦ Carbon-manganese steel
♦ Fully killed, aluminium treated fine grain steel
♦ Chemical composition (ladle analysis)
C Mn Si S P  
0.16%max footnote 0.7-1.60% 0.1-0.50% 0.025% max 0.025% max  
Optional additions: Alloys and grain refining elements may be generally in accordance with the following:
Ni Cr Mo Cu Nb V
0.8% max 0.25% max 0.08% max 0.35% max 0.05% max 0.1% max
Al content total 0.02% min (Acid soluble 0.015% min)
♦ Normalized, or quenched and tempered footnote
TENSILE AND TOUGHNESS (IMPACT) TEST REQUIREMENTS
Sampling frequency
♦ Plates Each "piece" to be tested
♦ Sections and forgings Each "batch" to be tested
Mechanical properties
♦ Tensile properties Specified minimum yield stress not to exceed 410 N/mm2 footnote
Toughness (Charpy V-notch test)
♦ Plates Transverse test pieces. Minimum average energy value (KV) 27J
♦ Sections and forgings Longitudinal test pieces. Minimum average energy (KV) 41J
♦ Test temperature 5°C below the design temperature or -20°C, whichever is lower
Guidance:
For materials exceeding 25 mm in thickness for which the test temperature is -60°C or lower, the application of specially treated steels or steels in accordance with table 6.3 may be necessary.
PLATES, SECTIONS AND FORGINGS footnote FOR CARGO TANKS, SECONDARY BARRIERS AND PROCESS PRESSURE VESSELS FOR DESIGN TEMPERATURES BELOW -55°C AND DOWN TO -165°C footnote Maximum thickness 25 mm footnote footnote
Minimum design temperature (°C) Chemical composition footnote and heat treatment Impact test temperature (°C)
-60 1.5% nickel steel – normalized or normalized and tempered or quenched and tempered or TMCP footnote -65
-65 2.25% nickel steel – normalized or normalized and tempered or quenched and tempered or TMCP footnote footnote -70
-90 3.5% nickel steel – normalized or normalized and tempered or quenched and tempered or TMCP footnote footnoteS -95
-105 5% nickel steel – normalized or normalized and tempered or quenched and tempered footnote footnote footnote -110
-165 9% nickel steel – double normalized and tempered or quenched and tempered footnoteS -196
-165 Austenitic steels, such as types 304, 304L, 316, 316L, 321 and 347 solution treated footnote -196
-165 Aluminium alloys; such as type 5083 annealed Not required
-165 Austenitic Fe-Ni alloy (36% nickel). Heat treatment as agreed Not required
TENSILE AND TOUGHNESS (IMPACT) TEST REQUIREMENTS
Sampling frequency
♦ Plates Each "piece" to be tested
♦ Sections and forgings Each "batch" to be tested
Toughness (Charpy V-notch test)
♦ Plates Transverse test pieces. Minimum average energy value (KV) 27J
♦ Sections and forgings Longitudinal test pieces. Minimum average energy (KV) 41J
PIPES (SEAMLESS AND WELDED) footnote, FORGINGS footnote AND CASTINGS footnote FOR CARGO AND PROCESS PIPING FOR DESIGN TEMPERATURES BELOW 0°C AND DOWN TO -165°C footnote Maximum thickness 25 mm
    Impact test
Minimum design temperature (°C) Chemical composition footnote and heat treatment Test temp. (°C) Minimum average energy (KV)
-55 Carbon-manganese steel. Fully killed fine grain. Normalized or as agreed footnote footnote 27
-65 2.25% nickel steel. Normalized, normalized and tempered or quenched and tempered footnote -70 34
-90 3.5% nickel steel. Normalized, normalized and tempered or quenched and tempered footnote -95 34
  9% nickel steel footnote. Double normalized and tempered or quenched and tempered -196 41
-165 Austenitic steels, such as types 304. 304L, 316, 316L, 321 and 347. Solution treated footnote -196 41
  Aluminium alloys; such as type 5083 annealed   Not required
TENSILE AND TOUGHNESS (IMPACT) TEST REQUIREMENTS
Sampling frequency
♦ Each "batch" to be tested.
Toughness (Charpy V-notch test)
♦ Impact test: Longitudinal test pieces
PLATES AND SECTIONS FOR HULL STRUCTURES REQUIRED BY 4.19.1.2 AND 4.19.1.3
Minimum design temperature of hull structure (°C) Maximum thickness (mm) for steel grades
  A B D E AH DH EH FH
0 and abovefootnote
-5 and abovefootnote 		Recognized standards
down to -5 15 25 30 50 25 45 50 50
down to -10 x 20 25 50 20 40 50 50
down to -20 x x 20 50 x 30 50 50
down to -30 x x x 40 x 20 40 50
Below -30 In accordance with table 6.2, except that the thickness limitation given in table 6.2 and in footnote of that table does not apply.
"x" means steel grade not to be used.
Parent topic: Chapter 6 – Materials of Construction and Quality Control
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