Foreword
Committees responsible
Specification
1 Scope
2 Information to be supplied by the purchaser and
options to be documented
3 Designation
4 Manufacture of the steel
5 Manufacture of the product
6 Chemical analysis
7 Heat treatment
8 Mechanical properties
9 Visual inspection and appearance
10 Tolerances
11 Tests
12 Number, selection and preparation of samples and
test pieces
13 Test methods
14 Retests
15 Test certificate
16 Protective clothing
17 Marking
Appendices
A Designations of steel tubes in BS 3604 : Part 1 and
the nearest equivalent designations in ISO 2604
Parts II and III
B Dimensional limits of tubes in relation to the
method of manufacture
C Estimated average stress-rupture values
D Procedure for the verification of elevated
temperature values
E Eddy current testing of tubes for verification of
leak tightness
F Ultrasonic testing of tubes for detection of
longitudinal imperfections
Tables
1 Method of manufacture of tube and reference
2 Steel type and type number
3 Chemical composition, mechanical properties at room
temperature, and heat treatment
4 Permitted deviations of the product analysis from
the specified ladle analysis
5 Minimum 0.2 % proof stress (Rp0.2) values at
elevated temperatures
6 Tests for test category 1 and test category 2
7 Designations of steel tubes in BS 3604 : Part 1 and
the nearest equivalent steel numbers in ISO 2604
Parts II and III
8 Dimensional limits of tubes in relation to the
method of manufacture for tubes supplied to outside
diameters and thicknesses
9 Estimated average stress rupture values
10 Parameters for lower confidence lines: steel types
620-440 : 1 % chromium 0.5 % molybdenum (normalized
and tempered), and 621 : 1.25 % chromium 0.5 %
molybdenum (normalized and tempered)
11 Parameters for lower confidence lines: steel type
660 : 0.5 % chromium 0.5 % molybdenum 0.25 %
vanadium (normalized and tempered)
12 Parameters for lower confidence lines: steel type
622 : 2.25 % chromium 1 % molybdenum (normalized
and tempered
13 Parameters for lower confidence lines: steel type
625 : 5 % chromium 0.5 % molybdenum (annealed)
14 Parameters for lower confidence lines: steel type
629-470 : 9 % chromium 1 % molybdenum (annealed)
15 Parameters for lower confidence lines: steel type
629-590 : 9 % chromium 1 % molybdenum (normalized
and tempered)
16 Parameters for lower confidence lines: steel type
762 : 12 % chromium 1 % molybdenum
17 Dimensions of reference holes for method A
18 Notch dimensions for method B
19 Reference notch dimensions and tolerances
Figures
1 Example of lower confidence lines for steel type 622