Rockwell stainless steels

Sulfide Stress Cracking) on steels over Rockwell C 22. (4) static stresses. other equipment handling sour gas, oil and/or water wherein H2S and H2O (liquid phase) are present up to about 150 F, where sulfide stress cracking slows down perceptibly. stainless steels with Rockwell hardness over C 22. (4) into crystal structure, exact mechanism uncertain. Sulfur expedites absorption of atomic H into grain structure. (4) if feasible use inhibitors and/or resistant coatings where feasible time or heating up will permit H to diffuse out but will not relieve any areas when H2 has concentrated. 

Materials of fabrication again vary with the nature of the gas being compressed but are usually low alloy steel, such as AISI4140 or 4340, heat treated at 1,100°F to Rockwell hardness 26 to 30, AISI Type 410 stainless steel, precipitationhardening stainless such as Armco 17-4PH or 15-5 PH, Type... 

E. C. Sanderson, A. W. Brewer, R. W. Krenzer, G. Krauss, Dislocation Substructures in High-Energy-Rate-Forged and Press-Formed 21-6-9 Stainless Steel , Rockwell International Atomics International Division, Rocky Flats Plant, P. O. Box 464, Golden, CO 80401, RFP-2743, July 24, 1978. 

Comparison of Rockwell hardness HRB with Rockwell hardness of special rocks and Vickers hardness for stainless steel containing 38% chromium and 8% nickel... 

HRC - Rockwell hardness scale C AISI 420 or DIN 1.2083 steel - stainless steel. Martensitic, chromium steel ... 

Molding of CSM requires some special care in the type of metal due to the acidic nature of CSM even with the presence of an acid acceptor. A hard surface (minimum 45 Rockwell C), abrasion and corrosion resistant and non-porous steel needs to be employed. A hard chrome plate at least 0.1 mm thick is recommended. Stainless steel is a more expensive but more effective alternative. Lower mold temperatures reduce mold fouling and corrosion if economics will allow. Molds need to be cleaned at least weekly with an alkali solution with ultrasonic vibration. 

The Hallam plant was a sodium cooled, graphite moderated reactor with a 256 MWt output (Allen, 1977). It started up in 1962 and was permanently shut down in 1964. Atomics International, a subsidiary of Rockwell Aerospace, designed the core and coolant system for this plant. The aggressive effects of the sodium coolant on several alloys were not fully appreciated when the reactor started up. As a result, corrosion on the stainless steel cladding of individual fuel elements led to this plant s shutdown after just over 1 year of operation (Anon., 1972). 

The stainless steel designations are those of the American Iron and Steel Institute. The composition of most of the other materials is listed in Engineering Alloys [23] and those not so listed are included in Table 5-2. All the materials were tested in the annealed condition except in the cases where parentheses follow the alloy designation, in Table 5-3. The number thus enclosed is the hardness of the material on either the Rockwell C (RC) or Rockwell B (RB) scale. 

Construct the mold from stainless steel with a minimum chromium content of 13%, preferably 16% the Rockwell C hardness must be at least 55. A full range of surface finishes is possible, on UPVC moldings, from high gloss to textured. Hardened steel molds may be protected by chrome plating. 

This is a high-carbon, high-chromium, corrosion-resistant alloy that can be described as either a high-hardness type 440C or a corrosion resistant, D2 tool steel. It possesses corrosion resistance equivalent to type 440C stainless but can attain a maximum hardness of Rockwell C 64, approaching that of tool steel. 

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