Disclosed herein are embodiments of a seamless quenched and tempered steel pipe having a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm. Embodiments of the steel pipe can comprise C, Mn, Cr, Ni, Mo, Al, Ca, N, Nb, Ti, Zr, and Ta. Further, for some embodiments of t
Disclosed herein are embodiments of a seamless quenched and tempered steel pipe having a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm. Embodiments of the steel pipe can comprise C, Mn, Cr, Ni, Mo, Al, Ca, N, Nb, Ti, Zr, and Ta. Further, for some embodiments of the steel pipe wherein, defining a first parameter P1=50×C+Cr+10×Mo+70×V, the chemical composition can satisfy a first condition P1≦8.0.
대표청구항▼
1. A seamless quenched and tempered steel pipe comprising: a yield strength from 415 MPa to 635 MPa and a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm;wherein the steel pipe has a chemical composition consisting of: 0.050-0.085 wt % C;0.80-1.65 wt % Mn;0.10-0.45
1. A seamless quenched and tempered steel pipe comprising: a yield strength from 415 MPa to 635 MPa and a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm;wherein the steel pipe has a chemical composition consisting of: 0.050-0.085 wt % C;0.80-1.65 wt % Mn;0.10-0.45 wt % Si;0.10-0.70 wt % Cr;0.08-0.45wt % Ni;0.08-0.40 wt % Mo;0.015-0.040 wt % Al;0.0008-0.0050 wt % Ca;0.0030-0.0090 wt % N;0.000-0.040 wt % Nb;0.000-.020 wt % Ti;0.000-0.030 wt % Zr;0.000-0.030 wt % Ta;0.000-0.010 wt % V;0.000-0.25 wt % Cu;0.000-0.003 wt % S;0.000-0.015 wt % P; and0.000-0.0005 wt % B;the remainder being Fe;wherein CEIIW=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15) is in the range of 0.36% to 0.43%;wherein, defining a first parameter P1=50×C+Cr+10×Mo+70×V, the chemical composition satisfies a first condition 4.22.3. 9. The seamless quenched and tempered steel pipe of claim 8, wherein the second parameter P2 satisfies the following conditions: P2>2.3 in order to meet the minimum yield strength required by the grade X60Q (415 MPa);P2>2.7 in order to meet the minimum yield strength required by the grade X65Q (450 MPa); andP2>3.5 in order to meet the minimum yield strength required by the grade X70Q (485 MPa). 10. The seamless quenched and tempered steel pipe of claim 8, wherein the second parameter P2 is lower than or equal to 4.0. 11. The seamless quenched and tempered steel pipe of claim 1, wherein: CEPCM=C+Si/30+Mn/20+Cr/20+Cu/20+Ni/60+Mo/15+V/10+5×B is in the range of 0.17% to 0.22%. 12. The seamless quenched and tempered steel pipe of claim 1, wherein the chemical composition consists of: 0.050-0.085 wt % C;0.95-1.30 wt % Mn;0.10-0.35 wt % Si;0.20-0.50 wt % Cr;0.15-0.40 wt % Ni;0.15-0.40 wt % Mo;0.000-0.010 wt % V;0.020-0.040 wt % Al;0.0008-0.0030 wt % Ca;0.020-0.040 wt % Nb;0.000-0.015 wt % Ti;0.0030-0.0070 wt % N;0.00-0.20 wt % Cu;0.0000-0.0020 wt % S;0.000-0.015 wt % P;0.0000-0.0005 wt % B;0.000-0.015 wt % Zr; and0.000-0.015 wt % Ta;the remainder being Fe. 13. The seamless quenched and tempered steel pipe of claim 1, wherein the chemical composition consists of: 0.060-0.080 wt % C;1.00-1.20 wt % Mn;0.10-0.30 wt % Si;0.30-0.40 wt % Cr;0.25-0.35 wt % Ni;0.30-0.35 wt % Mo;0.000-0.010 wt % V;0.020-0.030 wt % Al;0.0015-0.0030 wt % Ca;0.020-0.030 wt % Nb;0.000-0.015 wt % Ti;0.0030-0.0060 wt % N;0.00-0.15 wt % Cu;0.0000-0.0010 wt % S;0.000-0.011 wt % P;0.0000-0.0005 wt % B;0.000-0.010 wt % Zr; and0.000-0.010 wt % Ta;the remainder being Fe. 14. The seamless quenched and tempered steel pipe of claim 1, wherein the chemical composition consists of: 0.060-0.085 wt % C;0.95-1.30 wt % Mn;0.10-0.35 wt % Si;0.20-0.40 wt % Cr;0.25-0.40 wt % Ni;0.25-0.35 wt % Mo;0.000-0.010 wt % V;0.020-0.040 wt % Al;0.0008-0.0030 wt % Ca;0.020-0.040 wt % Nb;0.000-0.015 wt % Ti;0.0030-0.0070 wt % N;0.00-0.20 wt % Cu;0.0000-0.0020 wt % S;0.000-0.015 wt % P;0.0000-0.0005 wt % B;0.000-0.015 wt % Zr; and0.000-0.015 wt % Ta;the remainder being Fe;and satisfies the following additional conditions: P1=50×C+Cr+10×Mo+70×V in the range from 6.3 to 8.0;P2=10×C+Mn+Cr+4×Mo+16×V in the range from 2.75 to 3.8;CEIIW=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15 in the range from 0.38% to 0.43%; andCEPCM=C+Si/30+Mn/20+Cr/20+Cu/20+Ni/60+Mo/15+V/10+5×B in the range from 0.17% to 0.21%. 15. The seamless quenched and tempered steel pipe according to claim 1, wherein the chemical composition consists of: 0.050-0.080 wt % C;0.95-1.20 wt % Mn;0.10-0.35 wt % Si;0.10-0.30 wt % Cr;0.15-0.35wt % Ni;0.15-0.30 wt % Mo;0.000-0.010 wt % V;0.020-0.040 wt % Al;0.0008-0.0030 wt % Ca;0.020-0.040 wt % Nb;0.000-0.015 wt % Ti;0.0030-0.0070 wt % N;0.00-0.20 wt % Cu;0.0000-0.0020 wt % S;0.000-0.015 wt % P;0.0000-0.0005 wt % B;0.000-0.015 wt % Zr; and0.000-0.015 wt % Ta;the remainder being Fe;and satisfies the following additional conditions: P1=50×C+Cr+10×Mo+70×V in the range from 4.2 to 7.5;P2=10×C+Mn+Cr+4×Mo+16×V in the range from 2.31 to 3.66CEIIW=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15 in the range from 0.36% to 0.41%; andCEPCM=C+Si/30+Mn/20+Cr/20+Cu/20+Ni/60+Mo/15+V/10+5×B in the range from 0.16% to 0.21%. 16. A method for manufacturing a seamless quenched and tempered steel pipe comprising: hot forming a seamless steel pipe having a wall thickness (WT) higher than or equal to 35 mm and lower than or equal to 80 mm and a chemical composition consisting of: 0.050-0.085 wt % C;0.80-1.65 wt % Mn;0.10-0.45 wt % Si;0.10-0.70 wt % Cr;0.08-0.45 wt % Ni;0.08-0.40 wt % Mo;0.015-0.040 wt % Al;0.0008-0.0050 wt % Ca;0.0030-0.0090 wt % N;0.000-0.040 wt % Nb;0.000-0.020 wt % Ti;0.000-0.030 wt % Zr;0.000-0.030 wt % Ta;0.000-0.010 wt % V;0.00-0.25 wt % Cu;0.000-0.003 wt % S;0.000-0.015 wt % P; and0.0000-0.0005 wt % B;the remainder being Fe;cooling in air the seamless steel pipe down to reach room temperature;heating the seamless steel pipe, with a first heating rate between 0.1° C./s and 10° C./s, to an austenitizing temperature above the Ac3 transformation point, in a range between 880° C. and 980° C., and providing a soaking time between 180 s and 5400 s;quenching the seamless steel pipe using external and internal cooling, with a cooling rate greater than 6° C./s and up to 30° C./s at mid thickness of the pipe, and with a cooling rate of 100-200° C./s in proximity of the outer and inner surfaces of the pipe;heating the seamless steel pipe, with a second heating rate between 0.1° C./s and 10° C./s, to a tempering temperature comprised in a predetermined range, and providing a holding time at said tempering temperature between 600 s and 7200 s;wherein said predetermined range is calculated with a tolerance of ±20° C. using the following equation: T(°C.)=1000×(-1.42+C+1.84×Mn+4.6×Cr+11.6×Mo+25×V)a-3.8×C+1.5×Mn+4.3×Cr+10.7×Mo+20×V-273.15where a is a parameter having a value equal to −0.07, 0.16 or 0.40 if the grade to be achieved is X60Q, X65Q or X70Q, respectively; andwherein the final steel pipe has yield strength from 415 MPa to 635 MPa. 17. A pipe bend, obtained by a seamless steel pipe of claim 1, having maximum hardness values, measured at 1.5 mm to 2 mm depth from the surface, not higher than 235 HV10. 18. The pipe bend of claim 17, having a maximum hardness values, measured at 1.5 mm to 2 mm depth from the surface, not higher than 230 HV10.
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