Industeel Creusot

Creusot Loire Industrie

Industeel France

Usinor

Creusot Loire Industrie (societe Anonyme)

Creusot Loire Inudstrie

Creusot Loire Industrie (s.a.)

Dominique Viale

Jean Beguinot

Jean-Georges Brisson

Gilbert Primon

Frederic Chenou

Regis Blondeau

Philippe Bourges

Cedric Chauvy

Frédéric Bouchaud

Lionel Coudreuse

Jean Pisseloup

Jacques Charles

Valery Ngomo

Cédric Chauvy

Marie-Luce Nectoux

Jean-Luc Beau

Frederic Bouchaud

Valéry Ngomo

A method for manufacturing a weldable steel component having a chemical composition including, by weight: 0.40%&#x2264;C&#x2264;0.45%; 0.75%&#x2264;Si&#x2264;1.50%; 0.3%&#x2264;Mn&#x2264;3%; 0%&#x2264;Ni&#x2264;5%; 1.11%&#x2264;Cr&#x2264;4%; 0%&#x2264;Cu&#x2264;1%; 0.410%&#x2264;Mo&#x2264;1.5%; 0.410%&#x2264;Mo+W/2&#x2264;1.5%; 0.038%&#x2264;Nb&#x2264;0.3%; 0.0005%&#x2264;B&#x2264;0.010%; 0.006%&#x2264;N&#x2264;0.025%; Al&#x2264;0.9%; Si+Al&#x2264;2.0%, optionally at least one element selected among V, Nb, Ta, S and Ca, in contents less than 0.3%, and among Ti and Zr in contents not more than 0.5%, the rest being iron and impurities resulting from the preparation, the aluminium, boron, titanium and nitrogen contents, expressed in thousandths of %, of said composition further satisfying the following relationship: B&#x2265;&#x2153;&#xd7;K+0.5, (1) with K=Min (I*; J*), I*=Max (0; 1), and J*=Max (0; J), I=Min(N; N&#x2212;0.29(Ti&#x2212;5)), J=Min(N; 0.5(N&#x2212;0.52 Al+&#x221a;{square root over ((N&#x2212;0.52 Al)+283)})), and whereof the structure is bainitic, martensitic or martensitic/bainitic and additionally comprises 3 to 20% of residual austenite.

Weldable component of structural steel and method of manufacture

The invention concerns steel building components whereof the chemical composition comprises, by weight: 0.40 %=C=0.50%, 0.50%=Si=1.50%, 0%=Mn=3%, 0%=Ni=5%, 0%=Cr=4%, 0%=Cu=1%, 0%=Mo+W/2=1.5%, 0.0005%=B=0.010%, N=0.025 %, Al&#x2264;0.9%, Si+Al=2.0%, optionally at least one element selected among V, Nb, Ta, S and Ca, in contents less than 0.3%, and among Ti and Zr in contents not more than 0.5%, the rest being iron and impurities resulting from the preparation, the aluminium, boron, titanium and nitrogen contents, expressed in thousandths of %, of said composition further satisfying the following relationship: B=&#x2153;&#xd7;K+0.5, (1) with K=Min (1*; J*), I*=Max (0;1) and J*=Max(0;J), I=Min(N; N&#x2212;0.29(Ti&#x2212;5)), J=Min {N; 0.5 (N&#x2212;0.52 Al+v(N&#x2212;0.52 Al)+283)}, and whereof the structure is bainitic, martensitic or martensitic/bainitic and additionally comprises 3 to 20% of residual austenite. The invention also concerns a method for making said components.

Assembled submarine hull steel components, each steel component having a chemical composition consisting of, in weight percent:0.030%&#x2266;C&#x3c;0.080%0.040%&#x2266;Si&#x2266;0.13%0.1%&#x2266;Mn&#x2266;1.4%2%&#x2266;Ni&#x2266;4%Cr&#x2266;0.3%0.30%&#x2266;Mo+W/2+3(V+Nb/2+Ta/4)&#x2266;0.89%0.15%&#x2266;Mo&#x2266;0.89%V+Nb/2+Ta/4&#x2266;0.004%Nb&#x2266;0.004%Cu&#x2266;0.45%Al&#x2266;0.1%Ti&#x2266;0.04%N&#x2266;0.0300%impurities resulting from the production operation, said impurities includingB&#x2266;0.0005%,P+S&#x2266;0.015%,the balance being iron, the chemical composition complying with the condition:410&#x2266;540&#xd7;C+245[Mo+W/2+3(V+Nb/2+Ta/4)]&#x2266;460.

Submarine hull steel having enhanced weldability

The invention relates to a steel for the production of submarine hulls having the chemical composition:0.030%&#x2266;C&#x3c;0.080%0.040%&#x2266;Si&#x2266;0.48%0.1%&#x2266;Mn&#x2266;1.4%2%&#x2266;Ni&#x2266;4%Cr&#x2266;0.3%0.30%&#x2266;Mo+W/2+3(V+Nb/2+Ta/4)&#x2266;0.89%Mo&#x2267;0.15%V+Nb/2+Ta/4&#x2266;0.004%Nb&#x2266;0.004%Cu&#x2266;0.45%Al&#x2266;0.1%Ti&#x2266;0.04%N&#x2266;0.0300%the balance being iron and impurities resulting from the production operation, boron being an impurity whose content is less than 0.0005%, and P+S&#x2266;0.015%, the chemical composition complying with the condition:410&#x2266;540&#xd7;C+245[Mo+W/2+3(V+Nb/2+Ta/4)]&#x2266;460.

Steel for submarine hulls with improved weldability

The invention concerns mold or mold frame parts for plastic material injection molding made of quenched and tempered martensitic stainless steel consisting, in wt. %, of: 0.02%=C=0.09%, 0.025%=N=0.12% with 0.05%=C+N=0.17%; Si=0.34% Al=0.080% with Si+23 Al=0.20% and Si+0.6 Al=0.25%; and 0.00025=Al&#xd7;N=0.0020 0; 0.55%=Mn=1.8%; 11.5%=Cr=16% optionally up to 0.48% of copper, up to 0.90% of the sum Mo+W/2, up to 0.90% of nickel, up to 0.090% of vanadium, up to 0.090% of niobium, up to 0.025% of titanium, optionally up to 0.25 of sulphur, the rest being iron and impurities derived from preparation, the composition further satisfying the condition: 6.5=F&#x2550;(Cr+Mo)+2(Si+V+Nb)&#x2212;27(C+N)&#x2212;(Ni+Mn/2+Cu/3)=13.

Martensitic stainless steel for injection moulds and injection mould frames

High-strength steel of which the chemical composition comprises, by weight:

High-characteristic steel for large-size parts

The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%&#x2266;C&#x2266;0.8%, 0%&#x2266;Si&#x2266;2%, 0%&#x2266;Al&#x2266;2%, 0.35%&#x2266;Si+Al&#x2266;2%, 0%&#x2266;Mn&#x2266;2.5%, 0%&#x2266;Ni&#x2266;5%, 0%&#x2266;Cr&#x2266;5%, 0%&#x2266;Mo&#x2266;0.50%, 0%&#x2266;W&#x2266;1.00%, 0.1%&#x2266;Mo+W/2&#x2266;0.50%, 0%&#x2266;B&#x2266;0.02%, 0%&#x2266;Ti&#x2266;2%, 0%&#x2266;Zr&#x2266;4%, 0.05%&#x2266;Ti+Zr/2&#x2266;2%, 0%&#x2266;S&#x2266;0.15%, N&#x3c;0.03%; optionally from 0% to 1.5% of Cu; optionally Nb, Ta or V with Nb/2+Ta/4+V&#x2266;0.5%; optionally less than 0.1% of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1%&#x2266;C*=C&#x2212;Ti/4&#x2212;Zr/8+7&#xd7;N/8&#x2266;0.55% and 1.05&#xd7;Mn+0.54&#xd7;Ni+0.50&#xd7;Cr+0.3&#xd7;(Mo+W/2)+K&#x3e;1.8, with K=0.5 if B&#x2267;0.0005% and K=0 if B&#x3c;0.0005% and Ti+Zr/2&#x2212;7&#xd7;N/2&#x2267;0.05%; hardening after austenitization while cooling at a speed&#x3e;0.5&#xb0; C./s between a temperature&#x3e;ACand ranging between T=800&#x2212;270&#xd7;C*&#x2212;90&#xd7;Mn&#x2212;37&#xd7;Ni&#x2212;70&#xd7;Cr&#x2212;83&#xd7;(Mo+W/2) and T&#x2212;50&#xb0; C.; then at a core speed Vr&#x3c;115&#xd7;epbetween T and 100&#xb0; C., (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.

Method for making an abrasion-resistant steel plate and plate obtained

Method for reducing the segregated seams of a steel which has high mechanical strength and high wear resistance and whose composition comprises by weight: 0.30%&#x2266;C&#x2266;1.42%; 0.05%&#x2266;Si&#x2266;1.5%; Mn&#x2266;1.95%; Ni&#x2266;2.9%; 1.1%&#x2266;Cr&#x2266;7.9%; 0.61%&#x2266;Mo&#x2266;4.4%; optionally V&#x2266;1.45%, Nb&#x2266;1.45%, Ta&#x2266;1.45% and V+Nb/2+Ta/4&#x2266;1.45%; less than 0.1% of boron, less than 0.19% of (S+Se/2+Te/4), less than 0.01% of calcium, less than 0.5% of rare earths, less than 1% of aluminum, less than 1% of copper; the balance being iron and impurities resulting from the production operation. The composition further complies with: 800&#x2266;D&#x2266;1150 with D=540(C)+245(Mo+3V+1.5Nb+0.75Ta)+125Cr+15.8Mn+7.4Ni+18Si. According to the method, the molybdenum is completely or partially replaced with double the proportion of tungsten so that W&#x3e;0.21%, and Ti, Zr, C are adjusted so that, after adjustment, Ti+Zr/2&#x2267;0.2W, (Ti+Zr/2)&#xd7;C&#x2267;0.07, Ti+Zr/2&#x2266;1.49% and D is unchanged at approximately 5%. Steel obtained and method for producing a steel workpiece.

Steel having high mechanical strength and wear resistance

The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.1%&#x2266;C&#x3c;0.23%; 0%&#x2266;Si&#x2266;2%; 0%&#x2266;Al&#x2266;2%; 0.5%&#x2266;Si+Al&#x2266;2%; 0%&#x2266;Mn&#x2266;2.5%; 0%&#x2266;Ni&#x2266;5%; 0%&#x2266;Cr&#x2266;5%; 0%&#x2266;Mo&#x2266;1%; 0%&#x2266;W&#x2266;2%; 0.05%&#x2266;Mo+W/2&#x2266;1%; 0%&#x2266;Cu&#x2266;1.5%; 0%&#x2266;B&#x2266;0.02%; 0%&#x2266;Ti&#x2266;0.67%; 0%&#x2266;Zr&#x2266;1.34%; 0.05%&#x3c;Ti+Zr/2&#x2266;0.67%; 0%&#x2266;S&#x2266;0.15%; N&#x3c;0.03%, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V&#x2266;0.5%; optionally Se, Te, Ca, Bi, Pb contents &#x2266;0.1%; the rest being iron impurities. Additionally: 0.095%&#x2266;C*=C&#x2212;Ti/4&#x2212;Zr/8+7&#xd7;N/8, Ti+Zr/2&#x2212;7&#xd7;N/2&#x2267;0.05% and 1.05&#xd7;Mn+0.54&#xd7;Ni+0.50&#xd7;Cr+0.3&#xd7;(Mo+W/2)+K&#x3e;1.8, with K=1 if B&#x2267;0.0005% and K=0 if B&#x3c;0.0005%. After austenitization, the method consists in: cooling at a speed &#x3e;0.5&#xb0; C./s between a temperature between ACand T=800&#x2212;270&#xd7;C*&#x2212;90&#xd7;Mn&#x2212;37&#xd7;Ni&#x2212;70&#xd7;Cr&#x2212;83&#xd7;(Mo+W/2) and about T&#x2212;50&#xb0; C.; then cooling at a speed 0.1&#x3c;Vr&#x3c;1150&#xd7;epbetween T and 100&#xb0; C., (ep=plate thickness in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.

Abrasion-resistant steel plate

Method for reducing the segregated seams of a steel which has high mechanical strength and high wear resistance and whose composition comprises by weight: 0.30%&#x2266;C&#x2266;1.42%; 0.05%&#x2266;Si&#x2266;1.5%; Mn&#x2266;1.95%; Ni&#x2266;2.9%; 1.1%&#x2266;Cr&#x2266;7.9%; 0.61%&#x2266;Mo&#x2266;4.4%; optionally V&#x2266;1.45%, Nb&#x2266;1.45%, Ta&#x2266;1.45% and V+Nb/2+Ta/4&#x2266;1.45% ; less than 0.1% of boron, less than 0.19% of (S+Se/2+Te/4), less than 0.01% of calcium, less than 0.5% of rare earths, less than 1% of aluminum, less than 1% of copper; the balance being iron and impurities resulting from the production operation. The composition further complies with: 800&#x2266;D&#x2266;1150 with D=540(C)+245 (Mo+3 V+1.5 Nb+0.75 Ta)+125 Cr+15.8 Mn+7.4 Ni+18 Si. According to the method, the molybdenum is completely or partially replaced with double the proportion of tungsten so that W&#x3e;0.21%, and Ti, Zr, C are adjusted so that, after adjustment, Ti+Zr/2&#x2267;0.2 W, (Ti+Zr/2)&#xd7;C&#x2267;0.07, Ti+Zr/2&#x2266;1.49% and D is unchanged at approximately 5%. Steel obtained and method for producing a steel workpiece.

The invention concerns weldable steel building components whereof the chemical composition comprises, by weight: 0.10%&#x2266;C&#x2266;0.22%, 0.50%&#x2266;Si&#x2266;1.50%, AI&#x2266;0.9%, 0%&#x2266;Mn&#x2266;3%, 0%&#x2266;Ni&#x2266;5%, 0%&#x2266;Cr&#x2266;4%, 0%&#x2266;Cu&#x2266;1%, 0%&#x2266;Mo+W/2&#x2266;1.5%, 0.0005%&#x2266;B&#x3c;0.010%, N&#x2266;0.025%, optionally at least one element selected among V, Nb, Ta, S et Ca, in contents less than 0.3%, and/or among Ti and Zr in contents not more than 0.5%, the rest being iron and impurities resulting from preparation, the aluminium, boron, titanium and nitrogen contents, expressed in thousandths of %, of said composition further satisfying the following relationship: B&#x2266;&#x2153;&#xd7;K+0.5, (1) with K=Min (I*; J*), I*=Max (0; I) and J*=Max (0; J), I=Min (N; N&#x2212;0.29(Ti&#x2212;5)), J=Min {N; 0.5 (N 0.52 AI+&#x221a;j(N 0.52 AI)+283)}, the silicon and aluminium contents of the composition additionally verifying the following conditions: if C&#x3e;0.145, then Si+AI&#x3c;0.95 and whereof the structure is bainitic, martensitic or martensitic/bainitic and further comprises 3 to 20% of residual austenite.

Weldable steel building component and method for making same

A method for producing a plate of steel which is resistant to abrasion and whose chemical composition includes, by weight: 0.24%&#x2266;C&#x3c;0.35%; 0%&#x2266;Si&#x2266;2%; 0%&#x2266;Al&#x2266;2%; 0.5%&#x2266;Si+Al&#x2266;2%; 0%&#x2266;Mn&#x2266;2.5% 0%&#x2266;Ni&#x2266;5%; 0%&#x2266;Cr&#x2266;&#x3c;5% 0%&#x2266;Mo&#x2266;1%; 0%&#x2266;W&#x2266;2%; 0.1%&#x2266;Mo+W/2&#x2266;1%; 0%&#x2266;B&#x2266;0.02%; 0%&#x2266;Ti&#x2266;1.1%; 0%&#x2266;Zr&#x2266;2.2%; 0.35%&#x3c;Ti+Zr/2&#x2266;1.1%; 0%&#x2266;S&#x2266;0.15%; N&#x3c;0.03%, optionally up to 1.5% of copper; optionally at least one element selected from Nb, Ta and V at contents such that Nb/2 +Ta/4+V&#x2266;0.5%; optionally at least one element selected from among Se, Te, Ca, Bi, Pb at contents which are less than or equal to 0.1%; and the balance being iron and impurities resulting from the production operation. The chemical composition further complying with the following relationships: C*=C&#x2212;Ti/4&#x2212;Zr/8+7&#xd7;N/8&#x2267;0.095% and 1.05&#xd7;Mn+0.54&#xd7;Ni+0.50&#xd7;Cr+0.3&#xd7;(Mo+W/2)+K&#x3e;1.8 with: K=0.5 if B&#x2267;0.0005% and K=0 if B&#x3c;0.0005%.

Method for making an abrasion resistant steel plate and plate obtained

The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1%&#x2266;C&#x2266;0.23%; 0%&#x2266;Si&#x2266;2%; 0%&#x2266;AI&#x2266;2%; 0.5%&#x2266;Si+AI&#x2266;2%; 0%&#x2266;Mn&#x2266;2.5%; 0%&#x2266;Ni&#x2266;5%; 0%&#x2266;Cr&#x2266;5%; 0%&#x2266;Mo&#x2266;1%; 0%&#x2266;W&#x2266;2%; 0.05%&#x2266;Mo+W/2&#x2266;1%; 0%&#x2266;B&#x2266;0.02%; 0%&#x2266;Ti&#x2266;0.67%; 0%&#x2266;Zr&#x2266;1.34%; 0.05%&#x2266;Ti+Zr/2&#x2266;0.67%; 0%&#x2266;S&#x2266;0.15%; N&#x3c;0.030, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V&#x2266;0.5 %; optionally Se, Te, Ca, Bi, Pb contents &#x2266;0.1%; the rest being iron and impurities. Additionally: 0.095%&#x2266;C*=C&#x2212;Ti/4&#x2212;Zr/8+7&#xd7;N/8, Ti+Zr/2&#x2212;7&#xd7;N/2&#x2266;0.05% and 1.05&#xd7;Mn+0.54&#xd7;Ni+0.5O&#xd7;Cr+0.3&#xd7;(Mo++W1/2)+K&#x3e;1.8, with K=1 if B&#x2267;0.0005% and K=0 if B&#x3c;0.0005%. After austenitization, the method consists in: cooling at a speed &#x3e;0.5&#xb0; C./s between ACand T=800&#x2212;270&#xd7;C*&#x2212;90&#xd7;Mn&#x2212;37&#xd7;Ni&#x2212;70&#xd7;Cr&#x2212;83&#xd7;(Mo+W/2) and about T&#x2212;50&#xb0; C.; then cooling at a speed 0.1&#x3c;Vr&#x3c;150&#xd7;epbetween T and 100&#xb0; C., (ep=thickness of plate in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.

Method for making an abrasion-resistant steel plate

The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%&#x2266;C&#x2266;0.8%, 0%&#x2266;Si&#x2266;2%; 0%&#x2266;AI&#x2266;2%; 0.35%&#x2266;Si+AI&#x2266;2%; 0%&#x2266;Mn&#x2266;2.5%; 0%&#x2266;Ni&#x2266;5%; 0% &#x2266;Cr&#x2266;5%; 0%&#x2266;Mo&#x2266;0.050; 0%&#x2266;W&#x2266;1%; 0,1%&#x2266;Mo+W/2&#x2266;0.5%; 0%&#x2266;B&#x2266;0.02%; 0%&#x2266;Ti&#x2266;2%; 0%&#x2266;Zr&#x2266;4%; 0.05%&#x2266;Ti+Zr/2&#x2266;2%; 0%&#x2266;S&#x2266;0.15%; N&#x2266;0,03; optionally 0% to 1.5% of Cu; optionally Nb, Ta or V with Nb/2+Ta/4 +V&#x2266;0.5%; optionally less than 0.1% of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1 %&#x3c;C*=C&#x2212;Ti/4&#x2212;Zr/8+7&#xd7;N/8&#x2266;0.55% and 1.05&#xd7;Mn+0.54&#xd7;Ni+0.5O&#xd7;Cr+0.3&#xd7;(Mo+W/2)+K&#x3e;1.8, with K=0.5 if B &#x2267;0.0005% and K=0 if B&#x3c;0.0005% and Ti+Zr/2&#x2212;7&#xd7;N/2&#x2267;0.05%; hardening after austenitization while cooling at a speed &#x3e;0.5 &#xb0; C./s between a temperature &#x3e;ACand ranging between T=800&#x2212;270&#xd7;C*&#x2212;9O&#xd7;Mn&#x2212;37&#xd7;Ni&#x2212;70&#xd7;Cr&#x2212;83&#xd7;(Mo+W/2) and T&#x2212;50&#xb0; C.; then at a core speed Vr&#x3c;1150&#xd7;epbetween T and 100&#xb0; C., (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.

The invention relates to a tool steel, the composition of which comprises (the percentages being expressed in % by weight): the balance of the composition consisting of iron and impurities resulting from the smelting, it being furthermore understood that: 2.5&#xd7;10%&#x2266;(Ti+&#xbd;Zr)&#xd7;N, to a process for manufacturing parts made in this steel and to the parts obtained.

Growing community of inventors

Le Creusot, France

Jean Beguinot