Free cutting alloy

Free cutting alloy constituted as martensite containing stainless steel containing:

• 2 mass % or lower, including zero, Ni;
• 9 to 17 mass % Cr;
• one or more of Ti and Zr such that WTi+0.52 WZr=0.03 to 3.5 mass %, wherein WTi and WZr denote respective contents in mass % of Ti and Zr;
• and one or more of S and Se in the respective ranges of 0.01 to 1 mass % for S and 0.01 to 0.8 mass % for Se;
• and 0.19 mass % or more of C so as to satisfy the following formulae:
• 0.375 (WS+0.4 WSe )<WC≦1.5 (Formula A) 0.125 (WTi+0.52 WZr)<WC<1.5 (Formula B)
• , wherein WTi, WZr WC, WS and WSe denote respective contents of Ti, Zr, C, S and Se, all in mass %;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy constituted as austenite iron containing alloy containing:

• 2 to 50 mass % Ni;
• 12 to 50 mass % Cr;
• 5 to 85.926 mass % Fe;
• 0.021 to 0.4 mass % C.
• one or more of Ti and Zr such that WTi+0.52 WZr=0.03 to 3.5 mass %, wherein WTi and WZr denote respective contents in mass % of Ti and Zr;
• and one or more of S and Se in the respective ranges of 0.01 to 1 mass % for S and 0.01 to 0.8 mass % for Se so that the total amount of S and Se is more than the C content;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy constituted as electromagnetic stainless steel containing:

• 0.01 to 3, the upper limit not included, mass % Si;
• 2 mass % or lower Mn;
• to 25 mass % Cr;
• 0.01 to 5, the lower limit not included, mass % Al;
• one or more of Ti and Zr so that X defined by the following formula 1 is in the range of 0.05 to 0.5 mass %;
• C in the range of 0.02 X to 0.06 X mass %, wherein X is expressed by the following formula 1;
• one or more of S, Se and Te in the range of (Z−0.07)X to (Z+0.07)X mass %, wherein X, Z and Y are values of the respective following formulae 1, 3 and 2;
• Ti %+0.52 Zr %=X (Formula 1) S %+0.41 Se %+0.25 Te %=Y (Formula 2) 32(C %/X−0.125)2=Z (Formula 3)
• Fe being the main component of the alloy;
• inevitable impurities;
• wherein Pb content is less than 0.01 mass %;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy constituted as electromagnetic stainless steel containing:

• 0.01 to 3, the upper limit not included, mass % Si;
• 2 mass % or lower Mn;
• to 25 mass % Cr;
• 0.01 to 5, the lower limit not included, mass % Al;
• one or more of Ti and Zr so that X defined by the following formula 1 is in the range of 0.05 to 0.5 mass %;
• C in the range of 0.19 X to 0.26 X mass %, wherein X is expressed by the following formula 1;
• one or more of S, Se and Te in the range of (Z−0.07)X to (Z+0.07)X mass %, wherein X, Z and Y are values of the respective following formulae 1, 3 and 2;
• Ti %+0.52 Zr %=X (Formula 1) %+0.41 Se %+0.25 Te %=Y (Formula 2) 32(C %/X−0.125)2=Z (Formula 3)
• Fe being the main component of the alloy;
• inevitable impurities;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy constituted as electromagnetic stainless steel containing:

• 0.01 to 3, the upper limit not included, mass % Si;
• 2 mass % or lower Mn;
• to 25 mass % Cr;
• 0.01 to 5, the lower limit not included, mass % Al;
• one or more of Ti and Zr so that X defined by the following formula 1 is in the range of 0.05 to 0.5 mass %;
• C in the range of 0.02 X to 0.26 X mass %, wherein X is expressed by the following formula 1;
• one or more of S, Se and Te in the range of (Z+0.07)X to (Z+0.45)X mass %, wherein X, Z and Y are values of the respective following formulae 1, 3 and 2;
• Ti %+0.52 Zr %=X (Formula 1) S %+0.41 Se %+0.25 Te %=Y (Formula 2) 32(C %/X−0.125)2=Z (Formula 3)
• Fe being the main component of the alloy;
• inevitable impurities;
• wherein Pb content is less than 0.01 mass %;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy constituted as electromagnetic stainless steel containing:

• 0.01 to 3, the upper limit not included, mass % Si;
• 2 mass % or lower Mn;
• to 25 mass % Cr;
• 0.01 to 5, the lower limit not included, mass % Al;
• one or more of Ti and Zr so that X defined by the following formula 1 is in the range of 0.05 to 0.5 mass %;
• C in the range of 0.02 X to 0.26 X mass %, wherein X is expressed by the following formula 1;
• one or more of S, Se and Te in the range of (Z+0.45)X to (Z+0.70)X mass %, wherein X, Z and Y are values of the respective following formulae 1, 3 and 2;
• Ti %+0.52 Zr %=X (Formula 1) S %+0.41 Se %+0.25 Te %=Y (Formula 2) 32(C %/X−0.125)2=Z (Formula 3)
• Fe being the main component of the alloy;
• inevitable impurities;
• and wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.

Free cutting alloy containing 20 to 82 mass % Ni and the part except for Ni of which is mainly constituted by one or more of Fe and Cr further containing:

• one or more of Ti and Zr so that X defined by the following formula 1 in the range satisfying a relation of 0.05≦X≦3;
• one or more of S, Se and Te so that Y defined by the following formula 2 in the range satisfying a relation of 0.014≦Y≦0.5 X;
• C in the range satisfying a relation of 0.2 Y≦WC≦0.3, wherein when a Ti content is indicated by WTi in mass %, a Zr content by WZr in mass %, a C content by WC in mass %, a S content by WS in mass %, a Se content by WSe in mass % and a Te content by WTe in mass %, the following formulae 1 and 2 are given in order to define X and Y:
• X (mass %)=WTi+0.52 WZr (formula 1) Y (mass %)=WS+0.41 WSe+0.25 WTe (formula 2);
• one or more of Si, Mn and Al in the respective ranges of 1 mass % for Si, 1 mass % for Mn and 1 mass % for Al;
• wherein a (Ti, Zr) based compound containing one or more of Ti and Zr as a metal element component, C being an indispensable element as a bonding component with the metal element component, and one or more of S, Se and Te is dispersed in a matrix metal phase.