女人月North American Stainless
Flat Products Stainless Steel Grade Sheet
310S (S31008)/ EN 1.4845 Introduction:
SS310 is a highly alloyed austenitic stainless steel designed for elevated-temperature rvice. The high Cr and Ni contents enable this alloy to resist oxidation in continuous rvice at temperatures up to 1200°C provided reducing sulfur gas are not prent. In intermittent rvice it can be ud at temperatures up to 1030°C as it resists scaling and has a relatively low coefficient of expansion. This alloy has superior resistance to both SS304 and SS309 in carburizing and reducing environments.
SS310 types are ud for their high-temperature oxidation resistance for applications such
as furnace parts, mufflers, radiant tubes, ammonia converters, etc.
Product Range:
Product is available in Cold Rolled, Continuous Mill Plate and Plate Mill Plate form up to 60" wide in various thickness.
For inquiry about minimum quantity, specific thickness and tolerances, contact inside sales at NAS.
Certification:
ASTM A240, A480, A666, ASME SA240, SA480, SA666, ASTM A262, EN 10088-2,
EN 10028-7.
Chemical Composition :
UNS/Euro ASTM/Euro Carbon Mangane Phosphorous Sulfur Silicon Chromium Nickel S31008 310S 0.08 max 2 max 0.045 max 0.03 max 1.5 max 24-26 19-22
Mechanical Properties :
Tensile Strength min Yield Strength min Elongation min Hardness max 310S 75 ksi 30 ksi 40% 95 HRB
PROPERTIES AT ELEVATED TEMPERATURE
台式电脑音响>走一步再走一步读后感The properties quoted below are typical of annealed SS310S. The values are given as a guideline
only, and should not be ud for design purpos.
Physical Properties:
手机彩信THERMAL PROCESSING & FABRICATION
ANNEALING
Annealing is achieved by heating to between 1030°C and 1150°C for 90 minutes per 25mm thickness followed by water quenching. Annealing will ensure that any carbide precipitates are taken back into solution.
HOT WORKING
SS310 can be forged, hot headed and upt satisfactorily. Uniform heating of the steel in the range of 1150°C and 1250°C is required. The finishing temperatures should not be below 950°C. Forgings should be cooled rapidly in air or water. As precipitation of carbides can be harmful in corrosive environments, SS310S is recommended.
COLD WORKING
SS310 can be deep drawn, stamped, headed and upt without difficulty. Since SS310 work hardens, vere forming operations should be followed by annealing.
WELDING
SS310 can be satisfactorily welded and brazed by all methods, giving a tough weld. SS310S should be specified if carbide precipitation can have a detrimental effect on the performance of the steel under operating conditions.
Welding procedures for SS310 will have to be lected with care in order to avoid hot cracking due to the fully austenitic weld microstructure obtained from using matching filler metals.
CORROSION RESISTANCE
Becau of the many possible variations involved—temperature, corrosive environment, alloy composition, time, operating practice, etc.—it is difficult to discuss every combination in detail. Thus, the following data should be ud as a guideline. OXIDATION
In many process, isothermal (constant temperature) conditions are not maintained and process temperatures vary. Expansion differences between the ba metal and the scale during heating and cooling can cau cracking and spalling of the protective scale.
This allows the oxidizing media to attack the expod metal surface. The spalling resistance is greatly improved with the higher nickel content of SS310 becau nickel reduces the expansion differential between the scale and the ba metal.
直角三角形的面积公式
EFFECT OF ATMOSPHERE
An increa in corrosion rate can be expected in the prence of water vapor for the traditional 18/8 type stainless steels. The incread nickel and chromium contents of SS310 provide good resistance to moist air at temperatures in excess of 980°C. SULFUR VAPOR
Sulfur vapor readily attacks the austenitic grades. Typical corrosion rates for various stainless steels after 1300 hours exposure to flowing sulfur vapor at 570°C are shown below.
FLUE GASES
It is extremely difficult to generalize corrosion rates in flue and process gas since gas composition and temperature may vary considerably within the same process unit.
Combustion gas normally contain sulfur compounds, as sulfur dioxide is prent as an oxidizing gas, along with carbon dioxide, nitrogen, carbon monoxide and excess oxygen. Protective oxides are generally formed and, depending on exact conditions, the corrosion rate may be similar or slightly greater than for rvice in air.
Reducing flue gas contain varying amounts of hydrogen sulfide, hydrogen, carbon monoxide, carbon dioxide and nitrogen. The corrosion rates encountered in the environments are nsitive to hydrogen sulfide content and temperature, and satisfactory material lection often necessitates rvice testing. The high nickel content of SS310 may be deleterious in some instances due to sulfidation, in which ca SS309 may be the preferred material.
CARBURISATION
High chromium and nickel contents result in a slower diffusion rate of carbon into the steel. SS310 therefore has good resistance to carburizing atmospheres.
AMMONIA AND NITROGEN手抓饼皮的做法
The high nickel content of CS310 ensures a good resistance to ammonia atmospheres at high temp
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eratures. Typical corrosion rates for SS310 in an ammonia converter containing 5-6% NH3 after 30,000 hours at 500°C, are in the region of 0.003mm/yr.
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DISCLAIMER
The material contained in this Web Page/Sheet has been designed as a guide for customers of North American Stainless. However, the material contained herein is not intended as a substitute for any person’s procedures and should not be ud or relied upon for any specific or general application without first obtaining competent advice. Furthermore, North American Stainless disclaims any responsibility for the suitability of the steel in question for any particular purpo or for the performance or lection of the steel, unless North American Stainless specifically authorizes the purpo or lection. The material contained in this Web Page/Sheet does not purport to be a comprehensive or exhaustive statement of all relevant material applicable to special and general ste
el products and no reprentation, condition or warranty, express or implied, is given by North American Stainless as to the accuracy or completeness of this Web Page/Sheet and, so far as is permitted by law, North American Stainless, its members, staff and consultants disclaim any duty of care in relation to the preparation of this Web Page/Sheet and the information that it contains and shall not be liable for any direct,
