Steels_ Metallurgy and Applications, Third Edition

192 Steels: MetaUurgy and Applications

Table 2.18 Selection of steels for buildings

Maximum thickness of parts subjected to

applied tensile stress

BS 4360 Grade Sections (except Plates, wide flats

hollow sections) and and universal

flat bars wide flats

Internal External Internal External

(mm) (mm) (mm) (mm)

V~ues for k=l
43A 25 15 25 15
43B 30 20 30 20
43C 50 40 50 40
43D 50 50 75 75
43E 50 50 75 75
50A 16 10 16 10
50B 20 12 20 12
50C 40 27 75 55
50D 40 40 75 75
55C 19 16 19 16
55E 63 63 63 63
WR50A 12 12 12 12
WR50B 45 27 45 27
WR50C 50 50 50 50
Values for k = 2
43A 50 30 50 30
43B 50 40 50 40
43C 50 50 50 50
43D 50 50 75 75
43E 50 50 75 75
50A 32 20 32 20
50B 40 25 40 25
50C 40 40 75 75
50D 40 40 75 75
55C 19 19 19 19
55E 63 63 63 63
WR50A 12 12 12 12
WR50B 50 50 50 50
WR50C 50 50 50 50

After BS 5950: Part 1" 1985.

Rogerson and Jones 39 have reviewed the topic of steels for high-pressure gas
fittings and their summary of steel compositions is shown in Table 2.20. Thus,
proprietary C-Mn-V steels, such as Hyplus 29 and Creuselso 42, have been
used for these applications which produce yield strength values up to 450 N/mm 2,
depending upon section size. Nicuage IN787 has been used successfully in the
Alaskan oil pipelines in strength levels that satisfy X80. This Mn-Mo-Cu steel
also has the type of composition that is resistant to sour gas/oil environments, as
discussed in the next section.