A high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 750 MPa and excellent processing properties, said steel comprising the following elements in % by weight: C0.075 to 0.115; Si0.200 to 0.300; Mn1.700 to 2.300; Cr0.280 to 0.4800; Al0.020 to 0.060; N0.0020 to 0.0120; S0.0050; Nb0.005 to 0.050; Ti0.005 to 0.050; B0.0005 to 0.0060; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from the steel a sum content of M+Si+Cr in the steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.350 and 2.500%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.500 and 2.950%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.950 and 3.250%.

A high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 750 MPa and excellent processing properties, said steel comprising the following elements in % by weight: C0.075 to 0.115; Si0.200 to 0.300; Mn1.700 to 2.300; Cr0.280 to 0.4800; Al0.020 to 0.060; N0.0020 to 0.0120; S0.0050; Nb0.005 to 0.050; Ti0.005 to 0.050; B0.0005 to 0.0060; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from the steel a sum content of M+Si+Cr in the steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.350 and 2.500%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.500 and 2.950%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.950 and 3.250%.

An ultra-high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 950 MPa and excellent processing properties, includes the following elements in % by weight: C0.075 to 0.115; Si0.400 to 0.500; Mn1,900 to 2,350; Cr0.200 to 0.500; Al0.005 to 0.060; N0.0020 to 0.0120; S0.0030; Nb0.005 to 0.060; Ti0.005 to 0.060; B0.0005 to 0.0030; Mo0.200 to 0.300; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from said steel a sum content of M+Si+Cr in said steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.800 and 3.000%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.850 and 3.100%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.900 and 3.200%.

A continuous annealer for wire is disclosed, and specifically for annealing and recrystallizing a wire in a continuous process. The continuous annealer for wire comprises: two contact discs for contacting a first wire portion extending therebetween; an annealing zone situated between the two contact discs; and annealing means for annealing the first wire portion in the annealing zone, as a result of which a first partial recrystallisation process in the first wire portion takes place in the annealing zone. A recrystallisation zone is situated downstream of the second contact disc, wherein, downstream of the annealing zone, the first wire portion passes through the recrystallisation zone as the second wire portion, and a second partial recrystallisation process takes place in the second wire portion. The wire has the opportunity to recrystallize further after leaving the annealing zone without further heating. By extending the recrystallisation time, the recrystallisation temperature can be reduced accordingly. As a result, the same degree of recrystallisation can be achieved overall with a significantly lower input of energy than when the wire is cooled immediately after leaving the annealing zone.

An ultra-high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 950 MPa and excellent processing properties, includes the following elements in % by weight: C0.075 to 0.115; Si0.400 to 0.500; Mn1,900 to 2,350; Cr0.200 to 0.500; Al0.005 to 0.060; N0.0020 to 0.0120; S0.0030; Nb0.005 to 0.060; Ti0.005 to 0.060; B0.0005 to 0.0030; Mo0.200 to 0.300; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from said steel a sum content of M+Si +Cr in said steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.800 and 3.000%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.850 and 3.100%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.900 and 3.200%.

A high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 750 MPa and excellent processing properties, said steel comprising the following elements in % by weight: C0.075 to 0.115; Si0.200 to 0.300; Mn1.700 to 2.300; Cr0.280 to 0.4800; Al0.020 to 0.060; N0.0020 to 0.0120; S0.0050; Nb0.005 to 0.050; Ti0.005 to 0.050; B0.0005 to 0.0060; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from the steel a sum content of M+Si+Cr in the steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.350 and 2.500%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.500 and 2.950%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.950 and 3.250%.

A high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 750 MPa and excellent processing properties, said steel comprising the following elements in % by weight: C0.075 to 0.115; Si0.200 to 0.300; Mn1.700 to 2.300; Cr0.280 to 0.4800; Al0.020 to 0.060; N0.0020 to 0.0120; S0.0050; Nb0.005 to 0.050; Ti0.005 to 0.050; B0.0005 to 0.0060; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from the steel a sum content of M+Si+Cr in the steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.350 and 2.500%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.500 and 2.950%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.950 and 3.250%.

The invention relates to a creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having a working edge to be placed against the cylinder, wherein the creping blade has a tensile strength of 1800-2500 N/mm.sup.2 and a hardness of 57-66 HRC in the hardened and tempered condition and wherein the blade is made from a steel, which comprises the following main components (in wt. %): C: 1.2-1.5; Si: 0.1-0.8; Mn: 0.1-0.7; Cr: 4.2-5.2; Mo: 3.0-4.0; V: 3.2-4.2; N: 0.01-0.15; balance Fe and impurities.

The invention relates to a creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having a working edge to be placed against the cylinder, wherein the creping blade has a tensile strength of 1800-2500 N/mm.sup.2 and a hardness of 57-66 HRC in the hardened and tempered condition and wherein the blade is made from a steel, which comprises the following main components (in wt. %): C: 1.2-1.5; Si: 0.1-0.8; Mn: 0.1-0.7; Cr: 4.2-5.2; Mo: 3.0-4.0; V: 3.2-4.2; N: 0.01-0.15; balance Fe and impurities.

A process for the manufacture of a profiled wire of hydrogen-embrittlement-resistant, low-alloy carbon steel for flexible pipelines for the offshore oil and gas operations sector is provided. The process includes providing a low-alloy carbon steel wire rod having a composition including, expressed in percentages by weight of the total mass 0.75<C %<0.95; 0.30<Mn %<0.85; Cr0.4%; V0.16%; and Si1.40%, the rest being iron and the inevitable impurities from smelting of the metal in the liquid state. The process further includes hot-rolling the wire rod in an austenitic region above 900 C., cooling the wire rod to ambient temperature, subjecting the wire rod to isothermal quenching to obtain a homogeneous pearlitic microstructure, subjecting the wire rod to an operation of cold mechanical transformation, carried out with a global work-hardening ratio of from approximately 50 to 80%, to give the wire rod a diameter of from approximately 5 to 30 mm and subjecting the drawn wire to a short-duration recovery heat treatment carried out below an Ac1 temperature of the steel.