51results about How to "High uniform elongation" patented technology

A high strength steel sheet wherein: the chemical composition is, in mass%, C: 0.10-0.24%, Mn: 3.50-12.00%, Si: 0.005-5.00%, Al: 0.005-5.00%, P: 0.15% or less, S: 0.030% or less, N: 0.020% or less, O:0.010% or less, Cr: 0-5.00%, Mo: 0-5.00%, Ni: 0-5.00%, Cu: 0-5.00%, Nb: 0-0.50%, Ti: 0-0.50%, W: 0-0.50%, B: 0-0.010%, Ca: 0-0.05%, Mg: 0-0.05%, Zr: 0-0.05%, REM: 0-0.05%, Sb: 0-0.50%, Sn: 0-0.50%, As: 0-0.05%, V: 0-2.0%, balance: Fe and impurities; and the metal structure at the sheet thickness position is, in area%, retained austenite: 10.0-55.0%, high temperature tempered martensite: 30.0-75.0%, low temperature tempered martensite: 15.0-60.0%, the balance being fresh martensite: 0-10.0%, pearlite: 0-5.0% and bainite: 0-5.0%.

The invention relates to a strip consisting of an aluminum material for producing components with improved bending behavior and exacting shaping requirements, a method for producing the strip and the use of sheets produced from the strip according to the invention. The strip has a core layer of an AlMgSi alloy and at least one outer aluminum alloy layer arranged on one or both sides, made from a non-hardenable aluminum alloy, wherein the at least one outer aluminum layer has a lower tensile strength in the (T4) state than the AlMgSi layer, wherein the strip has a uniform strain (Ag) in the (T4) state of more than 23% transverse to the rolling direction and, at a thickness of 1.5 mm-1.6 mm, achieves a bending angle of less than 40° in a bending test.

A high strength galvanized steel sheet is provided comprising steel containing C: 0.06% or more and 0.20% or less, Si: less than 0.50%, Mn: 0.5% or more and less than 2.0%, P: 0.05% or less, S: 0.02% or less, Al: 0.60% or more and 2.00% or less, N: less than 0.004%, Cr: 0.10% or more and 0.40% or less and B: 0.003% or less, satisfying the relationships 0.8≦Mneq≦2.0 and Mneq+1.3[% Al]≧2.8, and a microstructure containing a ferrite phase and a second phase whose volume fraction is 15% or less, the second phase having a martensite phase whose volume fraction is 3% or more, a retained austenite phase whose volume fraction is 3% or more and a sum of the volume fractions of a pearlite phase and a bainite phase being equal to or less than the volume fraction of the martensite phase and the volume fraction of the retained austenite phase.

Disclosed are a steel plate, which shows an excellent aging treatment resistance of API 5L X70 grade or lower and has a low yield ratio, a high strength and a high uniform elongation, and a method for producing the same. Specifically disclosed is a steel plate showing an excellent strain aging resistance and having a low yield ratio, a high strength and a high uniform elongation, which comprises, in terms of mass%, 0.06-0.12% of C, 0.01-1.0% of Si, 1.2-3.0% of Mn, 0.015% or less of P, 0.005% or less of S, 0.08% or less of Al, 0.005-0.07% of Nb, 0.005-0.025% of Ti, 0.010% or less of N, 0.005% or less of O, and Fe and unavoidable impurities as the remainder, and the metal tissue of which consists of two phases of bainite and island martensite wherein the area proportion of the island martensite is 3-20% and the circle-equivalent diameter thereof is 3.0 [mu]m or less, characterized in that the uniform elongation of the steel plate before and after a strain aging treatment for 30 minutes or shorter at a temperature of 250oC or lower is 7% or more and the yield ratio thereof is 85% or less.

The invention discloses an X70 large deformation resisting pipeline steel and a manufacturing method. The steel comprises chemical components including, by mass percent, 0.04%-0.09% of C, 0.15%-0.55% of Si, 1.45%-1.75% of Mn, 0.04%-0.10% of Nb, 0.02%-0.08% of V, 0.01%-0.03% of Ti, 0%-0.20% of Cu, 0.15%-0.55% of Ni, 0%-0.15% of Mo, 0.15%-0.45% of Cr, 0.025%-0.045% of Al, 0.0002%-0.011% of N, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, and the balance Fe and other inevitable impurity elements. Production of the X70 large deformation resisting pipeline steel comprises the following process routes of material preparing, converter or electric furnace smelting, furnace exterior refining, casting, slab reheating, controlled rolling and controlled cooling, and after two-phase region quenching, tempering is conducted or the tempering technology is not adopted. Compared with the prior art, the X70 large deformation resisting pipeline steel and the manufacturing method have the beneficial effects that the yield ratio is lower, the uniform ductility is higher, tenacity matching is better, the steel plate and copper plate performance difference is small, the structure uniformity in the thickness direction is high, and the strip-shaped level is low.

The invention discloses anti-large-deformation pipe line steel prepared by a thermal treatment method and a preparation method thereof. The steel comprises the following chemical components of: not less than 0.02% and not greater than 0.12% of C, not less than 0.5% and not greater than 2.0% of Mn, not more than 0.25% of Si, not more than 0.02% of P, not more than 0.01% of S, not more than 0.11% of Nb, not more than 0.08% of V, not more than 0.05% of Ti, not more than 0.06% of Al, not more than 0.012% of N, not more than 0.50% of Cu, not more than 0.60% of Cr, not more than 0.50% of Mo, not more than 0.60% of Ni, not more than 0.005% of B, not more than 0.01% of Ca and the balance of Fe and inevitable impurities, wherein the CEIIW is not less than 0.3% and not greater than 0.45%, and the CEPcm is not more than 0.2%. The preparation method comprises the following steps of: heating steel at 700-950 DEG C in a thermal treatment furnace, maintaining the temperature for 6-15 min, cooling with the rate of 1-400 DEG C / s to room temperature, and simultaneously tempering from room temperature to 500 DEG C to obtain steel with ferrite as a first phase and bainite, martensite, degenerate perlite or any mixture thereof as a second phase. The steel has the advantages of high tensile strength, low yield strength, low yield ratio, high uniform elongation rate and high strain hardening exponent, thereby having good toughness and deformation performance.

The present invention relates to ferritic-austenitic stainless steel oriented to have low Ni which is excellent in corrosion resistance, particularly in corrosion resistance in a neutral chloride environment, and has high “uniform elongation”—a factor governing workability—and a method of production for the same.There are independently provided ferritic-austenitic stainless steels and methods of production for the same particularly having a corrosion resistance in a neutral chloride environment satisfyingPI value(=Cr+3Mo+10N−Mn)≧18% and having a uniform elongation satisfying−10≦Md≦110 (where Md=551−462({C}+[N])−9.2[Si]−8.1[Mn]−13.7[Cr]−29[Ni]−29[Cu]−18.5[Mo], where [ ] is composition (mass %) in the austenite phase, and { } is average composition (mass %))

The invention discloses a method for preparing a nano-twinned copper layer by using high-frequency pulses. The method utilizes a high-frequency pulse electroforming technique to prepare columnar nano-twinned copper in an additive-free, low-concentration copper sulfate electroforming solution. The nano-twinned copper layer prepared by the present invention guarantees high mechanical properties, and at the same time, the deposition speed of the cast copper layer is faster, the concentration of copper sulfate used is low, and no additives are added, the maintenance cost of the electroforming solution is greatly reduced, and the The impact of the electroforming process on the environment is conducive to the large-scale preparation of nano-twinned copper layers.

The invention discloses a 6061 aluminum alloy surface treatment method, which is to synthesize a TWIP steel coating in situ on the 6061 aluminum alloy surface by adopting a laser cladding method; the TWIP steel coating comprises 44-56 parts of Fe powder in parts by weight, 27‑31 parts of Mn powder, 7‑9 parts of Si powder, 3‑4 parts of Al powder and 2‑3 parts of C powder. The invention has the characteristics of good surface physical and chemical properties of the treated 6061 aluminum alloy and little damage to the base material.