TH30900B - Low alloy steel for the manufacture of plastic formwork. - Google Patents

Abstract

DC60 (05/04/53) is a steel for manufacturing molds for plastic injection molding. It is characterized by a chemical alloy composition by weight containing: 0.35% or less than or equal to C ≤ 0.5%, 0% or less than or equal to Si ≤ 0.5%, 0.2% or less than or equal to Mn ≤ 2.5%, 0% or less than or equal to Ni ≤ 4%, 0% or less than or equal to Cr ≤ 4%, 0% or less than or equal to Mo + W/2 ≤ 2%, 0% or less than or equal to Cu ≤ 1%, 0% or less than or equal to V + Nb/2 + Ta/4 ≤ 0.5%, 0.005% or less than or equal to A1 ≤ 0.2%, and 0% or less than or equal to... B is less than or equal to 0.015%, 0% is less than or equal to Ti + Zr/2 less than or equal to 0.3%, 0% is less than or equal to S + Se + Te less than or equal to 0.2%, 0% is less than or equal to Pb + Bi less than or equal to 0.2%, and 0% is less than or equal to Ca less than or equal to 0.1%. The remainder consists of iron and impurities resulting from production. Simultaneously, the analysis will follow the following relationships: Cr + 3 (No + W/2) + 10x(V + Nb/2 +Ta/4) greater than or equal to 1, R = 3.8 xC +10x Si + 3.3x Mn +2.4+ 1.4 x(Cr + W/2) less than or equal to. 11,Qu=3.8xC+1.1x Mn+0.7xNi+0.6x Cr + 1.6 x(Mo + W/2) + kB ≥ 3, where kB= 0.5 if B ≥ 0.005% and kB = 0 if not, and R ≤ Max (2.33x Qu- 1, 0.9x Qu + 4). Steel for mold making for plastic injection molding, which has been treated to have... The characteristic chemical composition by weight is as follows: 0.35% <-C 0.5%, 0% <- Si <- 0.5%, 0.2% <-Mn <-2.5%, 0% <- Ni <-4%, 0% <-Cr <-4%, 0% <-Mo + W/2 <-2%, 0% <-Cu <- 1%, 0% <-V +Nb/2 + Ta/4 <-0.5%, 0.002% <-B <-0.015%, 0.005% <- Al <-0.2%, 0% <-Ti + Zr/2 <-0.3%, 0% <-S + Se + Te <-0.2%, 0% <- Pb + Bi <- 0.2%, 0% <-Ca <-0.1%. The remainder consists of iron and impurities resulting from production. Meanwhile, the analysis follows the relationship... The following is also applicable: Cr + 3 (No + W/2) + 10x(V + Nb/2 +Ta/4) > 1, R = 3.8 xC +10x Si + 3.3x Mn +2.4+ 1.4 x(Cr + W/2)<-11,Qu=3.8xC+1.1xMn+0.7xNi+0.6x Cr + 1.6 x(Mo + W/2) + kB >-3 where kB= 0.5 if B >- 0.005% and kB = 0 if not, and R <- Max (2.33x Qu- 1, 0.9x Qu + 4).

Claims (20)

1. Steel for the manufacture of molds for injection molding of plastics or rubber, where the chemical composition of the steel by weight contains: 0.35% <- C <- 0.5% 0% <-Si <-0.5% 0.2% <-Mn <-2.5% 0% <-Ni <-4% 0% <-Cr <-4% 0% <-Mo + W/2 <-2% 0% V + Nb/2 + Ta/4 <-0.5% 0% <-B <-0.015% 0.005% <-Al <-0.2% 0% <-B <-0.015% At least one element from titanium and zirconium can be selected in amounts such that the sum of the amounts of titanium and half the amount of zirconium is less than or equal to 0.3%. At least one element from sulfur, selenium, and tellurium can be selected. Where the total amount of these elements is less than or equal to 0.2%, at least one element can be selected from lead and bismuth, where the total amount of these elements is less than or equal to 0.2%, calcium is selected in an amount less than or equal to 0.1%, and the remainder is iron and impurities resulting from production, where the analysis is consistent with the following relationship. Cr-3x(Mo+W/2)+10x(V+Nb/2+Ta/4)>-1 R=3.8xC+10xSi+3.3xMn+2.4xNi+1.4x(Cr+Mo+W/2)<-11 Qu=3.8xC+1.1xMn+0.7xNi+0.6xCr+1.6x(Mo+W/2)+kb>-3 where kB=0.5 if B >-0.0005% and kB=0 if not, and R<-Max (2.33xQu-1,99xQu+4) 2. Steel as entitled in Claim 1, where; Si<-0.15% 3. Steel as entitled in Claim 1, where; B<-0.0005% 4. Steel as entitled in Claim 1, where R<-9. 5. Steel as entitled in Claim 1 where; Qu>-4.3 6. Steel as entitled in Claim 1, where; Si<-0.1% 7. Steel as per the rights set forth in Patent 1, which; 0.37%<-C<-0.45% 0.%<-Si<-0.15% 0.2% <-Mn <-1.5% 0%<-Ni<-0.5% 0%<-Cr<-2.5% 0%<-Mo+W/2<-1% 0%<-Cu<-1% 0%<-V+Nb/2+Ta/4<-0.2% 0.005%<-Al<-0.2% 0.0005%<-B<-0.015% 0%<-Ti+Zr/2<-0.3% and R<-2.33xOu-2.4 8. Steel as claimed in Reputation 1, where the amount of titanium, zirconium and nitrogen should be such that 0.00003<-(N)xTi+Zr/2<-0.0016, and where in the solid state the amount of precipitated titanium or zirconium nitride larger than 0.1 µm counted on a 1 mm² area of the microscopic area is less than 4 times the sum of the total amount of precipitated titanium in nitride form and half of the total amount of precipitated zirconium in nitride form expressed as one thousandth of a % by weight. 9. Steel as entitled in Reputation 1, where the dimensions of the ingot are between 20 mm and 1500 mm, at all points the steel structure is martensite or bainite, and the hardness at all points is between 250 mirinells and 370 brinell. 10. A process for manufacturing molds incorporating steel casting as provided in Claim 1, using casting techniques for mold formation. 11. Welding wire or for the manufacture of welding electrodes, where this wire is made of steel as per claim 1. 12. Steel for manufacturing molds for injection molding of plastics or rubber, where steel by weight consists of 0.35% <- C <- 0.5% 0% <- Si <-0.5% 0.2% <- Mn <-2.5% 0% <- Ni <-4% 0% <- Cr <-4% 0% <- Mo + W/2 <-2% 0% V + Nb/2 + Ta/4 <-0.5% 0% <- B <-0.015% 0.005% <- Al <-0.2% 0% <- B <-0.015%. The remainder of the steel is iron and impurities resulting from the steelmaking process, where Cr-3x(Mo+W/2)+10x(V+Nb/2+Ta/4)>-1. R=3.8xC+10xSi+3.3xMn+2.4xNi+1.4x(Cr+Mo+W/2)<-11 Qu=3.8xC+1.1xMn+0.7xNi+0.6xCr+1.6x(Mo+W/2)+kb>-3 where kB=0.5 if B >- 0.0005% and kB=0 if not; and R<-Max (2.33xQu-1,99xQu+4) 13. The steel, as entitled in Clause 12, shall be further incorporated with at least one element of titanium and zirconium, where the sum of the amounts of titanium and half the amount of zirconium is less than or equal to 0.3%. 14. The steel, as entitled in Clause 12, shall be further incorporated with at least one element derived from sulfur, selenium, and tellurium, where the sum of the amounts of sulfur, selenium, and tellurium is less than or equal to 0.2%. 15. The steel, as entitled in Clause 12, shall be further incorporated with at least one element derived from lead and bismuth, where the sum of the amounts of lead and bismuth is less than or equal to 0.2%. 16. Steel as entitled in Claim 12 is further incorporated with calcium, where the amount of calcium is less than or equal to 0.1%. 17. The steel, as claimed in claim 13, is further composed of nitrogen, where the amounts of titanium, zirconium, and nitrogen are such that 0.00003<-(N)x(Ti+Zr/2)<-0.0016; and where, in the solid state, the amount of titanium nitride precipitate and the amount of zirconium nitride precipitate, at least one amount, which is larger than 0.1 µm and counted on an area of 1 mm² of the microscopic area, is less than 4 times the sum of the total amounts of titanium nitride and half the total amount of zirconium nitride, which are expressed as thousandths of a % by weight. 18. The process for manufacturing molds incorporating steel castings as provided in Claim 12, using casting techniques for mold formation. 19. Welding wire or wire for the manufacture of welding electrodes, which is made of steel as per claim 12. 20. Steel as entitled in Claim 12, where the thermal conductivity of the steel is at least approximately 46 W/m/Kelvin.