STAINLESS STEEL PRODUCTS

Stainless steel is a corrosion resistant steel alloy with a minimum of 10% chromium. There are different grades and surface finishes of stainless steel produced to accommodate the environment in which the material will be implemented. Unlike carbon steel, stainless steel does not rust when exposed to air and moisture due to the sufficient amount of chromium present. The chromium creates an invisible passive film of chromium oxide that will not let oxygen attack the surface and prevents rusting of the iron base.

Haohua Industry is a stainless steel distributor of more than 20 grades of Stainless Steel. 

Popular Stainless Steel Grades Available at haohua Industry

*Fittings include flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples.

Stainless steels can generally be categorized into 7 categories:

Ferritic Stainless Steels

Chromium is their major alloying element
Ductility and formability less than austenitic grades
Magnetic
Highly corrosion resistant, less durable than austenitic
Cannot be hardened by heat treatment
Contain between 10.5%-27% chromium and very little nickel
Common grades: part of the 400 series like 409, 410S, 430

Austenitic Stainless Steels

Comprise of 70% of total stainless steel production
Hardenable by cold working
Usually non-magnetic
High hardness and yield strength
Contain a maximum of 0.015% carbon, minimum of 16% chromium and sufficient nickel and/or manganese
Superaustenitic stainless steels (AL-6XN and 254 SMO)  have great resistance to chloride pitting and crevice corrosion
Common grades: 300 series like 304, 316, 320, 321, 347,309
 

Martensitic Stainless Steels

Highly machinable
Very strong and tough
Can be hardened by heat treatment
Magnetic
Contains chromium (12-14%), molybdenum (0.2-1%), nickel, (0 - < 2%), carbon (0.1 - < 1%)
Common grades: 410, 420, 440
 

Duplex Stainless Steels

Often divided into 3 sub classes
Lean Duplex
Standard Duplex
SuperDuplex
Mixed microstructure of austenite and ferrite about a 50/50 mix
Higher strength and better stress corrosion cracking resistance than most austenitic alloys
Greater toughness than ferritic alloys, especially at low temperatures
Good resistance to localized corrosion, particularly pitting, crevice corrosion and stress corrosion cracking
Common grades: 2205 and 2507

Precipitation-Hardening Martensitic Stainless Steels       

Designed to be formable in the solution annealed condition
Can be hardened by heat treatment
Contain chromium and nickel as major alloying elements
Corrosion resistance is usually better than that of straight chromium ferritics
Most common grade is 17-4PH

   

Superaustenitic Stainless Steels

Same structure as austenitic alloys
Enhanced levels of elements like chromium, nickel, molybdenum, copper and nitrogen
Superior strength and corrosion resistance
Common Grades: AL-6XN and 254 SMO
 

Superferritic

Structure and properties similar to ferritic alloys
Enhanced levels of chromium and molybdenum
Increased resistance to high temperatures and corrosive environments like seawater