Mirror Polish Stainless Steel Casting Foundry Door Handle Parts
SS304 / 304L
Product Description and Process
SS304 Stainless Steel Precision Investment Castings Door Handle
Parts Mirror Polish Products
Production process: Silica Sol lost wax investment casting process
Machining process: CNC machine, machining center, lathe, mill
machine, drill machine, etc.
Product Material and Uses
Normally produce with ASTM A743/A743M Grade CF8, CF8M, CF3, CF3M,
ZG0Cr18Ni10, ZG0Cr18Ni9, ZG0Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti,
ZG1Cr18Ni12Mo2Ti, etc.
POPULAR STAINLESS STEEL GRADES: SS 304 | SS 410 | SS 316 | 17-4
We has experience pouring a wide variety of stainless steel alloy
casts. We cast stainless steel from miniature to 50 pounds.
The most common alloys we have poured are listed below. We are also
capable of pouring other air melt alloys upon your request.
Specific material chemistry and mechanical specifications will be
provided to you if needed. For your Stainless Steel Castings needs,
we can help you out.
Commonly Cast Stainless Steel Alloys:
Stainless Steel 304(1.4308)
This is the most common stainless steel and is applied in different
applications. It consists of at least 18% chromium and 8% nickel
and has no magnetic properties within its austenitic structure.
Stainless Steel 304L(1.4309)
Corresponds to stainless steel 304. The ‘L’ stands for ‘low
carbon’, so this stainless steel has a lower carbon amount to
increase weldability and to limit the corrosion sensitivity after
welding.
Stainless Steel 316(1.4408)
A better, but more expensive type of corrosion resistant steel is
stainless steel 316. This alloy contains at least 16% chromium, 10%
nickel and 2% molybdenum. Because of the addition of molybdenum,
this stainless steel type is better defended against salt corrosion
and acids, and is often applied in chemical industries.
Stainless Steel 316L(1.4409)
Comparable to stainless steel 316 but with a lower carbon level to
increase weldability of the stainless steel.
17-4 PH(1.4549)
A high quality stainless steel which is regularly used in the
aircraft industry. It is characterized by a high tensile strength,
hardness, toughness and is also corrosion resistant.
Stainless Steel - Grade 304 (UNS S30400)
Chemical Formula
Fe, <0.08% C, 17.5-20% Cr, 8-11% Ni, <2% Mn, <1% Si,
<0.045% P, <0.03%
Background
Grade 304 is the standard "18/8" stainless; it is the most
versatile and most widely used stainless steel, available in a
wider range of products, forms and finishes than any other. It has
excellent forming and welding characteristics. The balanced
austenitic structure of Grade 304 enables it to be severely deep
drawn without intermediate annealing, which has made this grade
dominant in the manufacture of drawn stainless parts such as sinks,
hollow-ware and saucepans. For these applications it is common to
use special "304DDQ" (Deep Drawing Quality) variants. Grade 304 is
readily brake or roll formed into a variety of components for
applications in the industrial, architectural, and transportation
fields. Grade 304 also has outstanding welding characteristics.
Post-weld annealing is not required when welding thin sections.
Grade 304L, the low carbon version of 304, does not require
post-weld annealing and so is extensively used in heavy gauge
components (over about 6mm). Grade 304H with its higher carbon
content finds application at elevated temperatures. The austenitic
structure also gives these grades excellent toughness, even down to
cryogenic temperatures.
Key Properties
These properties are specified for flat rolled product (plate,
sheet and coil) in ASTM A240/A240M. Similar but not necessarily
identical properties are specified for other products such as pipe
and bar in their respective specifications.
Composition
Typical compositional ranges for grade 304 stainless steels are
given in table 1.
Table 1. 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 |
| 304L | min.
max. | -
0.030 | -
2.0 | -
0.75 | -
0.045 | -
0.030 | 18.0
20.0 | - | 8.0
12.0 | -
0.10 |
| 304H | min.
max. | 0.04
0.10 | -
2.0 | -
0.75 | -0.045 | -
0.030 | 18.0
20.0 | - | 8.0
10.5 | - |
Mechanical Properties
Typical mechanical properties for grade 304 stainless steels are
given in table 2.
Table 2. Mechanical properties of 304 grade stainless steel
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50 mm) min | Hardness |
| Rockwell B (HR B) max | Brinell (HB) max |
| 304 | 515 | 205 | 40 | 92 | 201 |
| 304L | 485 | 170 | 40 | 92 | 201 |
| 304H | 515 | 205 | 40 | 92 | 201 |
304H also has a requirement for a grain size of ASTM No 7 or
coarser.
Physical Properties
Typical physical properties for annealed grade 304 stainless steels
are given in table 3.
Table 3. Physical properties of 304 grade stainless steel in the
annealed condition
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100 °C (J/kg.K) | Electrical Resistivity (nΩ.m) |
| 0-100 °C | 0-315 °C | 0-538 °C | at 100 °C | at 500 °C |
| 304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Grade Specification Comparison
Approximate grade comparisons for 304 stainless steels are given in
table 4.
Table 4. Grade specifications for 304 grade stainless steel
| Grade | UNS No | Old British | Euro norm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
| 304L | S30403 | 304S11 | - | 1.4306 | X2CrNi19-11 | 2352 | SUS 304L |
| 304H | S30409 | 304S51 | - | 1.4948 | X6CrNi18-11 | - | - |
