Global Patent Index - EP 1239257 A1

EP 1239257 A1 2002-09-11 - Method for producing gun barrels

Title (en)

Method for producing gun barrels

Title (de)

Verfahren zur Herstellung von Rohren für schwere Geschütze

Title (fr)

Procédé pour la fabrication de tubes de canon

Publication

EP 1239257 A1 (DE)

Application

EP 02002665 A

Priority

DE 10111304 A

Abstract (en)

Production of tubes comprises twisting forged pieces from a molten block made from a tempered steel; initially hardening the blanks obtained; annealing; boring; and finishing. The tempered steel contains (in wt.%) 0.20-0.50 carbon, ≤ 1.0 silicon, ≤ 1.0 manganese, ≤ 0.03 phosphorus, ≤ 0.03 sulfur, ≤ 0.1 aluminum, ≤ 2 chromium, ≤ 4 nickel, ≤ 1 molybdenum, ≤ 0.5 vanadium and a balance of iron. Preferred Features: The tempered steel contains (in wt.%) 0.30-0.40 carbon, 0.15-0.35 silicon, 0.40-0.70 manganese, ≤ 0.015 phosphorus, ≤ 0.010 sulfur, ≤ 0.015 aluminum, 1.0-1.40 chromium, 2.50-3.50 nickel, 0.35-0.60 molybdenum, 0.08-0.20 vanadium and a balance of iron.

Abstract (de)

Der Verfahren zur Herstellung von Rohren für schwere Geschütze benutzt einen Vergütungsstahl, bestehend aus 0,20 - 0,50 Gew.% Kohlenstoff, max. 1,0 Gew.% Silizium, max. 1,0 Gew.% Mangan, max. 0,03 % Phosphor, max. 0,03 % Schwefel, max. 0,1 % Aluminium, max. 2 % Chrom, max. 4 % Nickel, max. 1 % Molybdän, max. 0,5 % Vanadin und zum Rest aus Eisen und üblichen Verunreinigungen. Es werden Schmiedestücke aus offen erschmolzenem Blockguss außen vorgedreht. Die dadurch erhaltenen Rohlinge werden zunächst gehärtet und angelassen, anschließend gebohrt und dann fertig bearbeitet.

IPC 1-7 (main, further and additional classification)

F41A 21/20; B21C 37/15; C21D 9/12; C22C 38/44; C22C 38/46

IPC 8 full level (invention and additional information)

B21C 37/06 (2006.01); C21D 9/12 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); F41A 21/20 (2006.01)

CPC (invention and additional information)

C22C 38/46 (2013.01); B21C 37/06 (2013.01); C21D 9/12 (2013.01); C22C 38/44 (2013.01); F41A 21/20 (2013.01); C21D 2261/00 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

EP 1239257 A1 20020911; EP 1239257 B1 20041027; AT 280938 T 20041115; DE 10111304 A1 20020919; DE 10111304 C2 20030320; ES 2230400 T3 20050501; US 2002124716 A1 20020912; US 6652680 B2 20031125

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