Austenitic:
Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.
Ferritic:
Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not hardenable by heat treatment.
Martensitic:
The characteristic orthorhombic martensite microstructure was first observed by German microscopist Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.
There are also other grades of stainless steels, such as precipitation-hardened, duplex, and cast stainless steels. Stainless steel can be produced in a variety of finishes and textures and can be tinted over a broad spectrum of colors.
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What kind of spheres we have?(similar products)
1.carbon steel balls
2.grinding steel balls
3.hollow stainless steel balls
4.large garden decoration balls
5.brass hemisphere
6.color gazing ball
7.precision steel ball
8.mirror polish ball
9.brushed stainless steel hollow stainless
PACKAGES
Outside packing:
2CM standard wooden crate with metal junction and nails;
Enough wood chunks as support for the inner products;
Anti-shaking;
Three strong strapping packing belts around the wooden crate ;
Inside Packing:
Thick plastic or soft foam to avoid scratches on the surface of the ball;
Shockproof foam to protect each carved garden ball for decoration.
Robust corrugated carton along with plastic soft shockproof foam to avoid scratches on the surface of the ball.
Different sizes are available.
SHIPPING
Modes of Shippment
Ground, Ship and Air
Ground:
Land or "ground" shipping can be by train or by truck. Ground transport is typically more affordable than air, but more expensive than sea especially in developing countries like India, where inland infrastructure is not efficient.
Shipment of cargo by trucks, directly from the shipper's place to the destination, is known as a door to door shipment and more formally as multimodal transport. Trucks and trains make deliveries to sea and air ports where cargo is moved in bulk.
Ship:
Much shipping is done aboard by actual ships. On rivers and canals, barges are often used to carry bulk cargo.
Air:
Cargo was transported by air in specialized cargo aircraft and in the luggage compartments of passenger aircraft. Air freight is typically the fastest mode for long distance freight transport, but also the most expensive.
304 widely used in the market. Used in iatrical instrument, chemical industry, avigation. Plastic hardware: scent bottles, sprayers, valves, nail polish, switches, washing machine, fridges, air condition, medicinal materials, automotive fittings, bearing, nursing bottle and so on. A representative of Austenitic. Nonmagnetic, but magnetic after rolling. Magnetism can be rid of, HRC ≤ 26. Antirust and anticorrosive. 304HC is softer and can be processed more easily than 304.
316 used in iatrical instruments, chemical industry, avigation, scent bottle, sprayer, valve, nail polish, mobile phone fittings. Austenitic. The best steel ball in the steel ball area, HRC ≤ 26. Better than 304. 316L is softer and more shinning than 316. Can be used in personal decoration.
Table 4. Grade specifications for 316 grade stainless steels.
Grade |
UNS |
Old British |
Euronorm |
Swedish |
Japanese |
||
BS |
En |
No |
Name |
||||
316 |
S31600 |
316S31 |
58H, 58J |
1.4401 |
X5CrNiMo17-12-2 |
2347 |
SUS 316 |
316L |
S31603 |
316S11 |
- |
1.4404 |
X2CrNiMo17-12-2 |
2348 |
SUS 316L |
316H |
S31609 |
316S51 |
- |
- |
- |
- |
|
Table 5. Possible alternative grades to 316 stainless steel.
Grade |
Why it might be chosen instead of 316 |
316Ti |
Better resistance to temperatures of around 600-900C is needed. |
316N |
Higher strength than standard 316. |
317L |
Higher resistance to chlorides than 316L, but with similar resistance to stress corrosion cracking. |
904L |
Much higher resistance to chlorides at elevated temperatures, with good formability |
2205 |
Much higher resistance to chlorides at elevated temperatures, and higher strength than 316 |
Composition ranges for 304 grade stainless steel
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
304 |
min. max. |
- 0.08 |
- 2.0 |
- 0.75 |
- 0.045 |
- 0.030 |
18.0 20.0 |
- |
8.0 10.5 |
- 0.10 |
Mechanical properties of 304 grade stainless steel
Grade |
Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness |
|
Rockwell B (HR B) max |
Brinell (HB) max |
||||
304 |
515 |
205 |
40 |
92 |
201 |