Pipe production from continuous-cast high-alloy steel blanks

Experiments are conducted on pipe production from continuous-cast billet made of TP 304L and TP 316L corrosion-resistant steel from various suppliers. A wide range of pipe is industrially produced by hot pressing and cold and hot rolling. Assessment of pipe quality shows compliance with the relevant standards.     

Continuous casting of billets made of a chromium-nickel titanium-containing corrosion-resistant steel

The continuous casting of a corrosion-resistant titanium-alloyed steel into billets is considered. Approaches to optimizing the chemical composition of the metal and the parameters of continuous casting are proposed to increase the quality of a continuously cast billet and the related rolled products.     

Working ability of cutting tools made from high-speed steel powders

Contact loads have been determined on the working surfaces of high-speed steel milling cutters, in which the working conditions have been extended up to the critical ones. After set intervals, the wear on the cutting surface and the hardness have been determined. This indicates that the working life of cutters made of R6M5F3-MP steel is more than twice that of tools made of traditional R6M5F3 steel.     

Fatigue strength of high-alloy corrosion-resistant TRIP steels (review)

The changes in the structural state of high-alloy TRIP steels during cyclic deformation in low- and high-cycle fatigue regions and the cyclic cracking resistance characteristics are analyzed. The strain-induced martensite that forms during cyclic deformation is shown to substantially affect the cyclic strength characteristics of the TRIP steels.     

商品化钢筋工业化生产配送势在必行

为了解决我国钢筋加工行业的落后面貌,降低钢材损耗,提高建筑施工行业科技水平,延伸建筑钢铁产业链,根据国家建设部指示精神,采用实践探索的方法对商品化钢筋加工这个课题进行深入的研究.在标准制定、管理平台、工艺流程、推广应用等方面做了大量有益的探索,并探索出工厂化生产的工艺流程及生产管理的信息平台.     

Applications of corrosion-resistant steel

Different classes of corrosion-resistant steel are considered. Competing grading systems are outlined. The basic characteristics, functions, and applicability of the steels are presented.     

Production of pipe blanks from corrosion-resistant duplex steel

The introduction of pipe-blank production (blank diameter 180 mm) from corrosion-resistant duplex steel (UNS S 31803, UNS S 32205, DIN 1.4462, and 03X22H5AM3) at PAO Dneprospetsstal’ plant is considered. The chemical composition of the melts at PAO Dneprospetsstal’ and pipe blank produced from duplex at traditional foreign suppliers is compared. The content of nonmetallic inclusions is studied, as well as the distribution and content of ferrite-austenite phases, the impact strength, the resistance to pitting corrosion, and the high-temperature deformability.     

State-of-the-art method of evaluating the quality of precision capillary tubes made of corrosion-resistant steel

The Pervoural’sk New Tube Plant has worked with the Metal-Shaping Department of Ural State Technical University to develop and successfully introduce a new technology for making precision capillary tubes of corrosion-resistant steel. Use of the new technology makes it possible to narrow the tolerances for diameter and wall thickness to ±0.015 mm and to establish a standard for internal surface roughness based on a maximum value of 0.80 μ for the parameter Ra (the actual roughness obtained is no greater than 0.50 μ). The new technology stabilizes the dimensions and surface quality of the tubes both within a given batch and from one batch to another. __________ Translated from Metallurg, No. 6, pp. 60–63, June, 2006.     

Production of sheet rolled products made of a nitrogen-bearing high-strength corrosion-resistant steel using electroslag remelting

A commercial electroslag remelting process is designed for the production of nitrogen-bearing steel. This process is shown to make a high-quality sheet product with higher strength characteristics and impact toughness as compared to rolled products of the nitrogen-bearing steel melted in an open electric arc furnace.     

Fabrication of high-alloy powders consisting of spherical particles from ultradispersed components

It is shown that powders of a model high alloy consisting of spherical particles 25–50 μm in size can be synthesized from a starting ultradispersed powder, which is made of a mixture of the alloy components and is fabricated by the magnesiothermal reduction of metal chlorides in the potassium chloride melt. The synthesis includes the stages of microgranulation of an ultradispersed powder, heat treatment of microgranules, classification of the microgranules with the separation of microgranule fraction of 25–50 μm, spheroidization of the separated fraction in a thermal plasma flow, and classification with the separation of a fraction of micro- and submicrometer-sized particles.     

Feeding and risering of high-alloy steel castings

A more accurate, less conservative set of feeding distance (FD) and riser sizing rules is developed for high-alloy steel castings produced from alloy grades CF-8M, CA-15, HH, HK, and HP. These rules are designed to produce radiographically sound castings at 2 pct sensitivity. By comparing results between plate casting trials and the corresponding simulations of those trials, a relationship is shown to exist between a local thermal parameter known as the Niyama criterion and ASTM shrinkage X-ray level. This relationship is then used in an extensive set of casting simulations to numerically determine FDs for a wide range of casting conditions. It is shown that the FD rule developed in an analogous earlier study for carbon and low-alloy (C&LA) steels can also be used for these high-alloy grades, provided that the FD is modified by a multiplier that accounts for the high-alloy steel grade. In addition, it is shown that multipliers for superheat, sand mold materials, and the use of chills developed in the earlier work are also valid with these high-alloy steel grades. In comparison with previously published high-alloy FD rules, the present rules are shown to provide longer FDs (and hence higher casting yields) in most casting situations. This study also investigates riser sizing rules. It is determined that for open top risers, the previously published C&LA riser sizing rule is also valid for high-alloy steels. This rule is less conservative than existing high-alloy riser sizing rules, specifying smaller risers that produce higher casting yields. In addition, for vented blind top risers, it is shown that the previously published rules are also overly conservative.     

Main laws of the formation of composite membranes made of palladium alloys on a carrier made of corrosion-resistant steel with directional porosity

The main stages of formation of thin-film membranes with a functional layer of palladium-ruthenium alloy on a foil carrier made of corrosion-resistant steel with directed pores are studied. Selective etching agents and etching modes are determined, and a project of a technological route for the production of such composite hydrogen-permeable membranes is developed.     

Edge defect analysis of high-strength corrosion-resistant steel

In this study,a 600 MPa hot-rolled corrosion-resistant steel plate produced by a specific company is investigated. Edge jagged defects and edge surface defects generated on both sides of the strip during production are characterized and analyzed. The results indicate that the distribution of reoxidation granules is located underneath the surface peel and that copper-containing granules diffuse along austenite grain boundaries. This phenomenon combined with the chemical composition and production parameters of a strip indicate that copper brittleness leads to edge jagged defects. However,the surface defects should be attributed to inherent defects on the surface of the strip. Measures that prevent surface oxidation and copper segregation at grain boundaries would likely eliminate these two types of edge defects.     

Possibility of making new easy-to-cut corrosion-resistant steel

The possibility of making corrosion-resistant bismuth-containing 08Kh18N10T steel for machining on computer-assisted machines under mass-production conditions is estimated. The steel quality is determined from its chemical composition, macrostructure, grain size, mechanical properties, and sensitivity to intercrystalline corrosion, and the machinability of the steel is also evaluated.