2011-2012 a record airplanes Alaska gold mining Almunium an ounce and Diamond Simulants astra mining Au auction Australian Gold Fields bank banks Banro barrick gold base metal based bauxite BHP Billiton Biggest Miner bigtruck Bitcoin Bitcoin Mining Hardware Blasting Blue Diamonds bullion bullion market Bullion reached a record Bullion rose buying Buying and Selling Diamonds and Gemstones canada mining Canadian investment fund industry canadian miner carbon cassiterite cat caterpillar Central Bank Gold Reserves Central Bank Purchases of Gold Central Fund of Canada Champagne Diamonds Chemical Formula Clarity and Carat weight coin coin gold collected Colour comex new york commodities companies cons Conveying copper Copper Issue 2011-2012 Cost Analysis Country Gold Reserves Crushing Cut Data Mining demand in Europe Diamond Business diamond mine location Diamond Mining Village diamonds dips discovery metals limited discussing Dividend Drilling ductile dumptruck dumptrucks earning Economic Benefits of Electronics Recycling Economic Opportunities Electronic Recycling element Engineering enterprise escort Estimated gold price in 2012 ETF euros FACILITIES AND UTILITIES for E-RECYCLING Ferrous Resources finance financial freeport fund gained gem global gold Gold approaching gold bar Gold Bars gold benefits gold bounces gold bullion Gold bullion prices 2012 gold bullion traders GOLD coin Gold Demand Gold depository services gold exchange gold fields Gold from Computer Parts gold fund gold futures Gold in Industrial Application Gold increase to a record price Gold Investment Gold Investment Product Demand Strong Gold Market GOLD Mining GOLD mining EQUIPMENT Gold Mining Stocks Gold Ore Production Freeport Gold Price Gold price in 2012 gold price per gram usd Gold Price Recovery gold priced Gold Prices in 2012 gold prices per ounce gold purity Gold rush Gold rush discovery Gold spot market price movement Gold Stock looks very attractive for change gold trader gold trading gold worth the risk Gold’s premium goldcorp goldnews goldprices Green Diamonds Hard Disk Computer Hauling held holdings How to Estimate Karat of Gold How to Invest Gold Human Resources Management in New York increase International Regulation invest invest gold invested investing gold investment investor investors Investors are now making a $130 billion bet on gold Iron iron ore Is Gold a Metal? Issue Issues in RECYCLING Japan is the only country that exports gold without being a major producer jewelry Johanesburg South African kinross kiyosaki LEGAL STRUCTURES List Platinum Mines South Africa Loading logistics london gold London’s luxury Magnesium manganese market market gold market value Martin mercury metal metal gold metal mining METAL Refining Metallic metalnews Metals mine mineral minerals Minerals Industry Mining Mining Business Mining Companies mining congress Mining Game mining group mining guide mining news mining occur mining palladium metal Mining Software mining truck miningnews Minnesota and Bechtel Moly Mines Ltd Most Expensive METAL motherboards Mutual Funds of Gold Investments Newmont Mining Corporation (NMC) nickel No Transunion Check Accounts Operations Osmium ounce oz palladium palladium weiƟgold pan american metals papua Pink Champagne Diamonds Pink Diamonds platinum platinum and palladium Platinum Group Metal Mining Companies platinum mining location precious metal precious metals price price gold bullion Price of Gold Today prices prices gold Prices of GOLD Processing producers production Profit Project pros PT Newmont Nusa Tenggara Indonesia rare reach record Refine Gold from PC Motherboards Refine Silver from Keyboard Computer resource Rhodium prices 2012 rise rising gold sands scrap gold Scrap metal prices Sell selling Shanghai Gold Exchange share silver Silver Coins Minting silver lake resources Silver Mining Companies silver prices Silver prices in 2012 silver standar silvercorp SOCIAL AND ENVIRONMENTAL CHALLENGES spot gold spot gold prices Stainless Steell Steel stock stock market Supply Management taconite tantalum the Comex The International Copper Study Group The World Gold Council the world’s largest miner thin film this year on Timing the gold market tin Titanium tons of bullion GOLD Top Companies in the Precious Metals Top Mining Companies TOP Reasons why GOLD is a GOOD Investment Top Silver Producer 2012 total gold demand trade Trade Gold Trail Transunion Dispute trucks Twin types of diamonds union uranium Urban Mining Value of Diamonds vena resources waste Waste Electrical and Electronic Equipment watertruck what is bitcoin What is Electronic Waste what is mining When is The Best Time To Buy Gold When is the best time to invest in gold White Diamonds Why invest in gold wide wideload worker world gold demand Yellow Diamonds

Types of Stainless Steel

Types of stainless steel is the large group.The large group of stainless steels can be divided into two groups Austenitic and Ferritic, the Ferritic group being split again into two groups,Martensitic and Ferritic. We know Stainless steel is a name given to a group of steel alloys that contain more than 12% Chromium. Chromium has a high affinity for oxygen and forms a stable oxide film on the surface of the stainless steel. This film is called the passive oxide layer and forms instantaneously in ordinary atmospheres.The film is self healing and rebuilds when it has been removed. It is this film that gives Stainless Steel its corrosion resistance.

AUSTENITIC GRADES
This group of stainless steels contains 17 – 25% Chromium and 8 – 20% Nickel with various additional elements to achieve the desired properties. In the fully annealed condition Austenitic stainless steels exhibit a useful range of mechanical and physical properties.Mechanical properties can be increased with cold working. Welding of this group must be caried out with correct methods but the low Carbon content results in fewer problems than with the Ferritic and Martensitic grades. Normally these stainless steels are non-magnetic but will become slightly magnetic when cold worked. Basic grades of Austenitic stainless steels are listed below.
Type AUSTENITIC GRADES : 303,304,304L,310S,316,316L,321.


MARTENSITIC GRADES
This group contains a 12% - 14% Chromium and 0.08% - 2.00% Carbon. The high Carbon content of the martensitic stainless steels allows them to respond well to heat treatment to give various mechanical strengths such as hardness 500004574. However, the Carbon is detrimental when welding and care must be taken. In the heat treated condition, this group of stainless steels show a useful combination of corrosion resistance and mechanical properties that qualify them for a wide range of application.
Type MARTENSITIC GRADES : 409,410,420,431

FERRITIC GRADES
This group contains a minimum of 17% Chromium and 0.08 – 2.00% Carbon. The increase in Chromium imparts increased resistance to corrosion at elevated temperature, however the lack of mechanical properties due to the fact that it cannot be heat treated, limits its applications. Like Martensitics they are magnetic and the welding of the group should be carried out with care.
Type FERRITIC GRADES : 430

DUPLEX / SUPER DUPLEX GRADES
This group of stainless steel has an annealed structure which typically consists of equal parts of austenite and ferrite. These steels have 18 – 29% chromium, 3 – 8% nickel and various other elements, particularly nitrogen and molybdenum. This group of steels has several advantages over austenitic steels. The duplex grades are highly resistant to chloride stress corrosion cracking, they have excellent pitting and crevice corrosion resistance and have about twice the yield strength of the common austenitic grades.
Type SUPER DUPLEX GRADE : 2205,S32750.