TH29352A - Repairable welding steel for the manufacture of plastic formwork. - Google Patents

Abstract

DC60 steel is used for manufacturing molds, and especially molds for plastic injection molding, with the following chemical composition by weight: 0.17% or equal to C ≤ 0.27%, 0% or equal to Si ≤ 0.5%, ≤ % or equal to Mn ≤ 2%, 0% or equal to Ni ≤ 2%, 0% or equal to Cr ≤ 3%, 0% or equal to Mo + W/2 ≤ 1.5%, 0% or equal to V + Nb/2 + Ta/4 ≤ 0.5%, 0.002% or equal to B ≤ 0.015%, 0.005% or equal to Al ≤ 0.2%. Alternatively, at least one element may be derived from sulfur, selenium, and tellurium. The sum of these elemental mixtures shall be less than or equal to 0.2%. Alternatively, at least one element shall be derived from titanium and zirconium in a mixture where the sum of titanium and half of the mixture shall be less than or equal to 0.3%. Alternatively, at least one element shall be derived from lead and bismuth. The sum of these elemental mixtures shall be less than or equal to 0.2%. Alternatively, calcium in the mixture shall be less than or equal to 0.1%, with the remainder being iron and production impurities. The chemical composition also follows the following relationships: Cr + 3 x (Mo + W/2) + 10 x (V + Nb/2 + Ta/4) greater than or equal to 2.1, Mo + W/2 > 0.7%. If Cr is less than or equal to 1.5%, Qu = 3.8 x C + 1.1 x Mn + 0.7 x Ni + 0.6 x Cr + 1.6 x (Mo + W/2) + 0.6 greater than or equal to 3, R = 3.8 x C + 10 x Si + 3.3 x Mn + 2.4 x Ni + 1.4 x (Cr + Mo + W/2) less than or equal to 11. Steel for casting and especially for injection molding has the following chemical composition by weight: 0.17% less than C, less than 0.27%, 0% less than Si, less than 0.5%, 0% less than Mn. Less than 2%, 0% Less than Cr Less than 3%, 0% Less than Mo + W/2 Less than 1.5%, 0% V + Nb/2 + Ta/4 Less than 0.5%, 0.002% Less than B Less than 0.015%, 0.005% Less than Al Less than 0.2% Alternatively, at least one element may be sourced from sulfur, selenium, and tellurium, with the sum of these elements being less than or equal to 0.2%. Alternatively, at least one element may be sourced from titanium and sorbonium in a mixture where the sum of the titanium mixture and half of the mixture is less than or equal to 0.3%. Alternatively, at least one element may be sourced from lead and bismuth, with the sum of these elements being less than or equal to 0.2%. Alternatively, calcium in the mixture is less than or equal to 0.1%, with the remainder being iron and production impurities. The chemical composition also follows the following relationship: Cr + 3 (No + W/2) + 10 * (V + Nb/2 + Ta/4) > 2.1, No + W/2 > 0.7%. If Cr is less than 1.5%, Qu = 3.8 x C + 1.1 x Mn + 0.7 x Ni + 0.6 x Cr + 1.6x(Mo + W/2) + 0.6 > 3, R = 3.8 * Si + 10 * Si + 3.3 * Mn + 2.4 * Ni + 1.4 * (Cr + Mo + W/2) less than 11 :

Claims (4)

Steel for the manufacture of molds, and especially molds for plastic injection molding, with a chemical composition by weight as follows: 0.17% <= C <= 0.27%, 0% <= Si <= 0.5%, 0% <= Mn <= 2%, 0% <= Ni <= 2%, 0% <= Cr <= 3%, 0% <= Mo + W/2 <= 1.5%, provided that if Cr <= 1.5%, then Mo + W/2 >= 0.7%, 0% V + Nb/2 + Ta/4 <= 0.5%, 0.002% <= B <= 0.015%, 0.005% <= Al <= 0.2%. Alternatively, at least one element is derived from sulfur, selenium, and tellurium, with the sum of these elements being less than or equal to 0.2%. Alternatively, at least one element is derived from titanium and sorbonium in such a way that... Ti+Zr/2<=0.3%, and with the presence of nitrogen in the steel alloy and titanium added to the steel, the amounts of Ti, Zr, and N are such that 0.00003<=(N)xTi+Zr/2)<=0.0016. In the solid state, the amount of precipitated titanium nitride or zirconium nitride larger than 0.1 Un counted in the 1 sq mm area of the solid steel microstructure is less than 4 times the sum of the precipitated titanium nitride mixture, and half of the total mixture of precipitated zirconium nitride is expressed as one thousandth of % by weight. Alternatively, at least one element is derived from lead and bismuth, and the total mixture of these elements is less than or equal to 0.2%. Alternatively, calcium in the mixture is less than or equal to 0.1%, with the remainder being iron and production impurities. The chemical composition also follows the following relationships: Cr + 3 (Mo + W/2) + 10 * (V + Nb/2 + Ta/4) > 2.1 Qu = 3.8 x C + 1.1 x Mn + 0.7 x Ni + 0.6 x Cr + 1.6x(Mo+ W/2) + 0.6 > 3 R = 3.8 * Si + 10 * Si + 3.3 * Mn + 2.4 * Ni + 1.4 * (Cr+ Mo + W/2)<= 11 2. Steel conforming to claim 1 where 0.02%<= C <= 0.24% 3. Steel conforming to claim 1 where 1.5% <=Cr <= 2.5% 4. Steel conforming to claim 3 where 0.5% <=Mo + W/2 <=1.2% 5. Steel conforming to claim 1, where the chemical alloy follows the following relationship: BH = 326 + 847.3 * C 18.3 * Si * Mn - 12.5 * Cr > 460 6. Steel conforming to claim 1, where the chemical alloy follows the following relationship: Cr + 3 (Mo + W/2) + 10 * ( V + Nb/2 + Ta/4) > 3.6 7. Steel conforming to claim 1, where si <= 0.2% 8. Steel conforming to claim 1, where Si <= 0.1% 9. Welding wire or electrode wire, consisting of steel conforming to claim 1 10. Steel conforming to claim 1, where the chemical alloy follows the following relationship: By weight, the composition includes: 0.2% <=C <=0.24%, 0% <=Si <=.1%, 0% <=Mn <=2%, 0% <=Ni <=0.5%, 1.5% <=Cr <=2.5%, 0.5% <=Mo + W/2 <=1.2%, 0% <=V + Nb/2 + Ta/4 <=0.15%, 0.002% <=B <=0.015%, 0.005% <= Al <=0.2%. The chemical composition also follows the following relationship: Cr + 3 (No + W/2) + 10 * (V + Nb/2 + Ta/4) > 3.6 Qu = 3 R <=1.5 + 1.83 Qu 1 1. A method for the production of molds for plastic injection molding, incorporating the formation of a steel alloy mold as claimed in claim 1.1. 2. A method consistent with claim 11 in which the formwork is prepared using casting technique 1. 3. Steel conforming to claim 11 where the steel has a thermal conductivity >= 45 W/m/K. 4. Steel conforming to claim 1 where the difference in strength between the heat-affected region of the weld (ZAH) and the base metal H is <=Brinell.