Tenaris Connections Limited

Dalmine S.p.a.

Héctor Manuel Quintanilla Carmona

Ettore Anelli

Alfonso Izquierdo Garcia

Emanuele Paravicini Bagliani

Victor Blancas Garcia

Stafano Fare

Andrea Di Schino

José Enrique Garcia Gonzalez

Marco Mario Tivelli

Disclosed herein are embodiments of a seamless quenched and tempered steel pipe which can have a wall thickness WT higher than or equal to 6 mm and lower than or equal to 35 mm. Some embodiments of the steel pipe can have a chemical composition comprising C, Mn, Si, Cr, Ni, Mo, Al, N, Ca, Nb, Ti, V, Zr, and Ta based on the composition weight, the remaining being iron and impurities. In some embodiments, wherein (V+Nb) content is lower than 0.07 wt %; defining a first parameter P1=(60&#xd7;C)+Cr+[5&#xd7;e]+50&#xd7;(V+Nb), the chemical composition satisfies a first condition P1&#x2266;14.5.

High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes

A low-alloy steel containing, by weight percent, C 0.03-0.13%, Mn 0.90-1.80%, Si&#x2266;0.40%, P&#x2266;0.020%, S&#x2266;0.005%, Ni 0.10-1.00%, Cr 0.20-1.20%, Mo 0.15-0.80%, Ca&#x2266;0.040%, V&#x2266;0.10%, Nb&#x2266;0.040%, Ti&#x2266;0.020% and N&#x2266;0.011% for making high-strength, weldable steel seamless pipe, characterized in that the microstructure of the alloy steel is a mixture of bainite and martensite and the yield stress is at least 621 MPa (90 Ksi). It is a second object of the present invention to provide a high-strength, weldable steel seamless pipe, comprising an alloy steel containing, by weight percent, C 0.03-0.13%, Mn 0.90-1.80%, Si&#x2266;0.40%, P&#x2266;0.020%, S&#x2266;0.005%, Ni 0.10-1.00%, Cr 0.20-1.20%, Mo 0.15-0.80%, Ca&#x2266;0.040%, V&#x2266;&#x2266;0.10%, Nb&#x2266;0.040%, Ti&#x2266;0.020% and N&#x2266;0.011% also characterized in that the microstructure of the alloy steel is predominantly martensite and the yield stress is at least 690 MPa (100 ksi).

High-strength steel for seamless, weldable steel pipes

Growing community of inventors

Veracruz, Mexico

Héctor Manuel Quintanilla Carmona