BS 970 (Part 3):1991 226M44 Steel: Specifications & Listings

Maximum unless a range is stated.

Source: BS 970 (Part 3):1991, Table 12

Condition	Reference symbol	Size (mm)	Tensile strength Rm (MPa)	Yield Re, min (MPa)	Elongation, min (%)	Impact Izod, min (J)	Impact KCV, min (J)	Rp0.2, min (MPa)	Hardness HB	Notes
Hardened and tempered + turned or ground	R	≥ 6 < 100	700-850	450	16	27	22	415	201-255
Hardened and tempered + turned or ground	S	> 6 ≤ 29	775-925	525	14	20	16	495	223-277
Hardened and tempered + turned or ground	T	> 6 ≤ 13	850-1000	600	12	20	16	585	248-302	(1)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground	R	≥ 6 to < 100	700-850	525	12	27	—	435	201-255
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground	S	> 6 to ≤ 29	775-925	575	10	20	—	520	223-277
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground	T	> 6 to ≤ 13	850-1000	630	9	20	—	600	248-302	(4)

Condition letters P to Z are the tensile strength ranges of Table 29. Rp0.2 applies when specifically ordered (note 3). Hardness HB is for guidance only except in the softened condition (note 13). Impact: Izod, or KCV when the standard impact test is not required (option A.3). Note 1: For cold drawn bar below 6 mm all mechanical properties to be agreed at enquiry and order. Note 4: These properties cannot always be obtained by bulk heat treatment of bar but can be achieved by the appropriate heat treatment of components by the purchaser.

Source: BS 970 (Part 3):1991, Table 19

Normalizing, hardening and tempering temperatures as given in Tables 27 and 28 (clause 4.2); Table 22 hardening temperatures for case hardening steels.

Source: BS 970 (Part 3):1991, Table 28