18Ni(350) martensite aging steel pipe/tube

1.round bar diameter:8-2000mm. 2.plate/sheet thickness:2-200mm. 3.forgings weight:0.5-10000Kg. .

1. Type analysis                    

         C........0.03 max;         Si.......0.10 max         Mn.....0.10 max.       S......0.010 max.        P......0.010max.        Co........11.0 – 12.75.

       Ni.....17.0 – 19.0        Mo.......4.0 – 5.0.        Ti......1.20 – 1.45      Al.....0.05 – 0.15.      Fe.........Balance

2.description 

     Marage 300 is an age- hardenable (maraging) iron-nickel steel combining ultra-high strength, toughness and resistance to

crack propagation. The alloy is well suited to applications where heat treatment distortion and dimensional changes must beminimized and where high fracture toughnessis required such as rocket motor casings, light aircraft landing gear, power shafts and low temperature tooling.

3.Machanical propertis

                             Solution Annealed                                                   Solution Annealed plus aged                              1500F (816C)                                                        900F (482C)                                     1 hr,                                                                                    AC 3 hrs, AC                             0.2% Yld,  ksi         115                                                                260                              UTS, ksi                 145                                                                270                                El, %                       20                                                                   10                                RA, %                     70                                                                   60                              Hardness, Rc         30                                                                   50 

 The 18% nickel maraging steels offer a unique combination of properties not available from conventional low alloy ultra high strength steels. They offer high strength, high ductility and toughness, and resistance to crack propagation. Hardening isaccomplished by a simple aging cycle of 3 hours at 900°F (482°C) followed by air cooling. The 18%Ni /Marage 300 provides through hardening without quenching, freedom from decarburization, minimal distortion during aging,good formability, machinability, and weldability and a low coefficient of thermal expansion.