Stainless steel ASTM methods

Clark, W. L., Cowan, R. L. and Walker, W. L., Comparative Methods for Measuring Degree of Sensitisation in Stainless Steel, ASTM STP 656, ASTM, Philadelphia, 99 (1978)... 

An ASTM recommended practice (A Standard Reference Method for Making Potentiostatic and Potentiodynamic Anodic Polarisation Measurements, G5 1972) has been issued. It provides a means of checking experimental technique and instrumentation using a specimen from a single heat of AISI Type 430 stainless steel, which is available from ASTM. ... 

With small modifications, ASTM standard G48 can be used to determine a CPT. The test is used as a ranking parameter for the resistance to pitting of high-alloyed austenitic stainless steels. In this method, material coupons are typically exposed for 24 or 72 h to a 6% FeCl3 (=1.11 mole/liter) solution at fixed temperatures (typically with 2.5°C intervals). The CPT is defined as the lowest temperature at which the specimen is attacked by pitting corrosion. 

Corrosion—While corrosion is usually not a concern on hot surfaces, recognize that all systems have shut down periods, with the probability that moisture will find ingress and condense. Many insulalions arc alkaline and have little adverse effect on iron and copper, but aluminum is affected adversely. A major concern is stress-corrosion of stainless steel induced by even trace amounts of soluble chlorides un ASTM Test Method maybe used. 

The smoke chamber method described in ASTM E 662 is often supplemented with toxic gas analysis. A PTFE-lined stainless steel tube is used to take a gas sample from the geometric center of the chamber at a specified time. This time can be fixed, for example V/2 or 4 min into the test, or variable, for example immediately following the maximum specific optical density. Regulations and specifications that call for these measurements require the concentration of a predefined set of gases to be determined. The product is acceptable if the concentration of every gas is within specified limits. These limits have been established from experience based on data for products that are deemed to be acceptable or not acceptable. 

Stainless steel classifications are based on material properties, method of fabrication and use of the end product. There are various societies, institutes, and so on, that classify stainless steel according to their own concerns and uses. You will most frequently run across the classifications from the American Iron And Steel Institute (AISI) and the American Society For Testing And Materials (ASTM). 

The analysis of separated volatile fraction can be carried out using a number of gas chromatographic columns and conditions including those described in the Standard Test Method ANSI/ASTM D 2267-68 (3). The following conditions were used by us in the laboratory studies GC column, 6% OV 101 on 100-120 mesh Chromosorb G-HP, 5 ft X i in-stainless steel column temperature, 1.5 min hold at 60°C, temperature programmed to 105 °C at 10°C/min detector, hydrogen flame ionization. 

Electrodeposition is currently used in a minority of laboratories to prepare a thin, uniform, and reproducible source. The alpha-particle emitting isotopes of plutonium are electrodeposited on polished stainless steel, or platinum disk. In the co-precipitation technique, a small amount of a carrier (e.g., LaF 3) is used to co-precipitate the separated and purified plutonium from solution. The precipitate is then prepared for counting by either filtration or by evaporation of a slurry of the precipitate onto a stainless steel disk or planchet (ASTM 1982 1987). Recent methods use a glass fiber filter which can be used as the source for alpha counting techniques. It has been suggested that low yields result from electrodeposition due to the presence of traces of interfering elements (e.g., iron) (Bernhardt 1976). 

ASTM G48-76, Standard Methods for Pitting and Crevice Corrosion, Resistance of stainless steel and Related AUoys by Use of Ferric Chloride Solution, American Society for Testing and Materials, Philadelphia, Pa. 

ASTM G59 descrihes a method for conducting potentiodynamic polarization resistance measurements [14]. It descrihes a setup for type 430 stainless steel in sulfuric acid, as for ASTM G5 described earher, and the same apparatus is specified. According to this standard, the potential should he scanned from 30 mV negative of the corrosion potential to 30 mV positive of the corrosion potential at a rate of 0.167 mV s . ... 

ASTM G106 describes a method to check the equipment and technique for collecting and presenting EIS data [16]. Type 430 stainless steel is to be tested in 0.005 M H2SO4-f 0.495 M Na2S04. A 10-mV amplitude signal is applied at the corrosion potential at 8-10 steps per decade from 10 000 to 0.1 Hz. The results of round-robin testing are provided. 

G150-99, Standard test method for electrochemical critical pitting temperature of stainless steel. Annual Book of ASTM Standards, ASTM International, Philadelphia, Pa., 2000, p. 638, Vol. 3.02. 

ASTM A-262 [7.21] has standardized five different methods for testing intergranular corrosion of austenitic stainless steels, after Streicher (two), Huey, Warren and Strauss. The Warren test, using exposure to nitric acid-fluoric acid, is particularly suited for molybdenium-alloyed steels. 

Properties ASTM Test Method 40% Glass- and Mineral-reinforced 40-45% Mineral-filled 30% Graphite or PAN Carbon Eiber 40% Aluminum Flake 5% Stainless Steel, Long Eiber 6% Stainless Steel, Long Eiber... 

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