Sage Journals: Discover world-class research

Abstract

Experiments have been carried out to develop a type of steel based on C-Mn-Al-Nb compositions which allows the dynamic precipitation of fine particles to take place during normal hot rolling. Therefore when the steel product cools, after rolling, it transforms from a fine-grained austenitic structure to a fine ferrite-pearlite mixture. The fine-grained microstructure produced in this way can also be dispersion strengthened and made to possess combinations of strength and toughness equivalent to those found in products processed by the more expensive normalizing or controlled-rolling routes. The development work has been carried forward into production and at least 8000 t of structural sections have been hot rolled with minimum yield strengths of 355MN m⁻² and Charpy impact energies in excess of 27J at 233 K using a steel composition based on 0·08C-1·3Mn-0·03Al min.-0·06Nb.

Get full access to this article

View all access options for this article.

References

WEBSTER

and WOODHEAD

J. H.

: J. Iron Steel Inst., 1969, 202, 987.

MORRISON

W. B.

, MINTZ

, and COCHRANE

R. C.

: Paper presented at BSC conference on ‘Controlled processing of high strength low alloy steels’, York, September 1976.

GLADMAN

: Proc. R. Soc., 1966, 294A, 298.

FRAZIER

R. H.

, BOULGER

F. W.

, and LORIG

C. H.

: J. Met., 1956, 1269.

GLADMANF

and B. PICKERING: J. Iron Steel Inst., 1967, 205, 653.

GRAY

J. M.

: Paper presented at ‘Processing and properties of low carbon steel’, Cleveland, Ohio, October 1972.

KOZASU

, OUCHI

, SAMPEI

, and OKITA

: Paper presented at ‘Micro-alloying ‘75’, Washington, October 1975.

MORRISON

W. B.

: J. Iron Steel Inst., 1963, 201, 317.

BOULGERW

F. W.

and R. HANSEN: Trans. AIME, 1963, 227, 1212.

10.

WILLIAMSON

: BSC, personal communication.

11.

MACKENZIE

C. R.

: personal communication.

12.

CURRY

and RAINE

G. A.

: BSC, personal communication.

13.

JONES

J. D.

and BURTON

: BISRA Report MGC/184/65.

14.

PHILLIPS

and CHAPMAN

J. A.

: BISRA Report MG/C/37/64.

15.

PHILLIPS

: British Patent No. 1058146.

16.

DUCKWORTH

W. E.

, PHILLIPS

, and CHAPMAN

J. A.

: J. Iron Steel Inst., 1965, 203, 1108–1114.

17.

PROUD

L. W.

, LYONS

J. V.

, and BERRY

B. W.

: ‘Strong tough struc-tural steels’; 150; 1967, London, The Iron and Steel Institute.

18.

BROWNLEE

: BISRA 65th Steelmaking Conference, Scar-borough, 12–13 October 1965.

19.

MACKENZIE

C. R.

: BSC, personal communication.

20.

LONG

: BSC, personal communication.

21.

SHAUGHNESSY

R. N.

, WITTY

R. W.

, and ACKERT

R. J.

: German Patent Application No.2 3237 38.

22.

HEITMANN

W. E.

, OAKWOOD

T. G.

, GRAY

J. M.

, and WILSON

W. G.

: 13th Annual CIM Conference of Metallurgists, Toronto, August 1974.

23.

IRVINEF

K. J.

and B. PICKERING: J. Iron Steel Inst., 1963, 201, 944.

24.

JONES

J. D.

and ROTHWELL

A. B.

: ‘Deformation under hot working conditions’, 78; 1968, London, The Iron and Steel Institute

25.

REPAS

P. E.

: Spring Meeting of the AIME, Las Vegas, Nev., 1970.

26.

VODOPIVEC

: J. Iron Steel Inst., 1973, 211, 664; Met. Technol., 1974, 1, 151.

27.

SEKINE

and MARUYAMA

: ‘The microstructure and design of alloys’, Vol. 1, 85; 1974, London, The Metal Society

28.

GRAY

J. M.

and YEO

R. B. G.

Trans. ASM, 1968, 61, 255.

29.

Department of Energy: ‘Guidance rules for offshore instal-lations'; 1977, HMSO.

Hot-rolled notch-tough structural steels

Abstract

Get full access to this article

References