Resistance against gouging and abrasive wear in impact crushing arms cast from Mn-steel, is related to variations of carbon, manganese and the microstructure of the cast steel. Additions of Boron, molybdenum and chromium to the plain Mn-steel casts (0.8-1.4%C-13%Mn) increase its wear resistance and fatigue life time during crushing operation due to enhancement of its strain hardeing capacity, grain refinement and strengthening by solid solution hardening of the matrix. This improvement is due to the intended change in the microstructure where precipitation of boron carbides and chromium carbides inside the austenitic matrix, grain refinement and increasing soluble carbon content in austenite phase is occurred. Solution treated Mn-steels (1050C, 2h, WQ) alloyed with boron showed crushing capacity of about 1200-1550 tones basalt per set depending on their compositions. The hardness of the as water quenched austenite is increased by about 25% to reach 397 HB when alloyed with 0.37%B. However work hardened matrix of Cr+Mo+B modified Mn-steel impact arms showed a bulk hardness of about 498 HB. The fatigue resistance of boron alloyed steel is increased to about 1.4 times over that measured for plain Mn-steel.

Login to Download full PDF Article...


Please login / register to post comments

news in steel

Perfectly matched value adding system that fulfills the requirements of the chemical industry

ACHEMA visitors will observe the function of the system using both steel and plastic drums in a simulated circuit. An automatic labeler perfectly rounds out the simulation. A video will also demonstrate in an entertaining way how the process connection with SAP works.

ANDRITZ delivers new walking beam furnace for wire mill at Swiss Steel AG

International technology group ANDRITZ has received an order from Swiss Steel AG, Switzerland, for the supply, installation, and startup of a new walking beam furnace with an output of 150 t/h for heating the continuous-cast billets at the Emmenbrücke plant, Switzerland. Start-up is scheduled for the fourth quarter of 2019.

Saarstahl AG and Mapudo GmbH are presenting themselves together for the first time at the "Wire"

Start-up Mapudo is the new “online wire” connection to Saarstahl

· Source 2A material easily using the platform mapudo.com

· Joint presentation in hall 12 at stand A 72

Expansion: GFH GmbH increases office and production space

Since the laser micro machining specialist GFH has grown continuously at an average rate of 50% over the last few years, a decision was made in the spring of 2016 to increase production capacities and expand at the Deggendorf location.