DIN 1.4472 High Nitrogen Steel Round Bar

Product Description

DIN 1.4472 High Nitrogen Stainless Steel Round Bars, Rods, and Bars

DIN Werkstoff Nr. 1.4472standardized in Europe as X4CrNiMoN21-9-4 or X2CrNiMoN21-16-5-4 and internationally recognized under UNS S31675, ASTM F1586, and ISO 5832-9is a high-purity, fully austenitic high-nitrogen stainless steel. Produced using vacuum-arc remelting or electroslag remelting processes, it is engineered for high-fatigue surgical implants, orthopaedic hardware, dental devices, and specialized non-magnetic components. The addition of 0.25 to 0.50 percent nitrogen in solid solution delivers nearly double the yield strength of standard 316L stainless steel alongside enhanced resistance to pitting, crevice corrosion, and cyclic fatigue.

Standards and Equivalent Designations

Primary specifications include DIN Werkstoff Nr. 1.4472, EN name X4CrNiMoN21-9-4 or X2CrNiMoN21-16-5-4, ISO 5832-9, ASTM F1586, and UNS S31675. Common commercial trade designations include Rex 734, UGIPURE 4472, and Chronifer M-1586.

Chemical Composition Limits

The chemical composition mandates 19.50 to 22.00 percent chromium, 9.00 to 11.00 percent nickel, 2.00 to 4.25 percent manganese, 2.00 to 3.00 percent molybdenum, 0.25 to 0.50 percent nitrogen, and 0.25 to 0.80 percent niobium. Maximum impurity limits require no more than 0.030 percent carbon, 0.75 percent silicon, 0.025 percent phosphorus, 0.010 percent sulfur, and 0.25 percent copper, with iron providing the balance.

Physical Properties

DIN 1.4472 steel features a density of 7.88 grams per cubic centimeter (0.285 pounds per cubic inch) and a tension modulus of elasticity of 200 gigapascals. The alloy delivers a Pitting Resistance Equivalent Number between 33.0 and 38.0. Due to its nitrogen-stabilized austenitic matrix, it maintains a magnetic permeability below 1.005, remaining non-magnetic even after substantial cold working.

Mechanical Properties

Mechanical requirements vary depending on whether the bar stock is supplied in the solution-annealed state or cold-worked condition.

In the solution-annealed condition, round bars mandate a minimum tensile strength of 740 megapascals (107 ksi), a minimum 0.2 percent yield strength of 430 megapascals (62 ksi), a minimum elongation of 35 percent, and a typical hardness between 200 and 250 Brinell.

In the cold-worked high-strength condition, minimum tensile strength increases to 1000 megapascals (145 ksi), minimum 0.2 percent yield strength increases to 750 megapascals (109 ksi), elongation ranges from 10 to 15 percent, and hardness reaches 30 to 38 Rockwell C.