Green Sand Casting
What is Green Sand Casting?
Green Sand Casting is mainly differed with resin sand casting . The mould sand is taken from rivers, and then put some others in sand to increase their viscidity.
Green sand is an aggregate of sand, bentonite clay, pulverized coal and water. Its principal use is in making molds for metal casting. The largest portion of the aggregate is always sand, which can be either silica or olivine. There are many recipes for the proportion of clay, but they all strike different balances between moldability, surface finish, and ability of the hot molten metal to degas. The coal, typically referred to in foundries as sea-coal, which is present at a ratio of less than 5%, partially combusts in the presence of the molten metal leading to offgassing of organic vapors. Read more
DIN EN 1561-1997 Grey Cast Iron
Grey Iron Specifications DIN EN1561. Compare GG serires with EN-JL grades. this material is suitable to sand casting production.
Grey Cast iron is a casting alloy, iron and carbon based, the latter element being present mainly in the form of lamellar graphite particles.
The properties of grey cast iron depend on the form and distribution of the graphite and the structure of the matrix. Read more
Stainless Steel Castings
Stainless Steel include austenitic stainless steel martensitic stainless steel and ferric stainless steel. this material is suitalbe to sand casting and investment casting method.
Austenitic steels have austenite as their primary phase Read more
BS EN 877 Cast Iron Pipe and Fittings
Grey Cast iron Property and chemical composition
Grey Cast Iron (Gray iron castings) is so called because of the colour of the fracture face. It contains 1.5-4.3% carbon and 0.3-5% silicon plus manganese, sulphur and phosphorus. It is brittle with low tensile strength, but is easy to cast.
The all data in this documents is referred to Chinese standard of GB/T 9439-1988.
grey cast iron composition.pdf
Single Casting Specimen Tensile Strength Property
|
Gray Iron Grade |
Single Specimen Tensile Strength σb≥/Mpa |
Gray iron Castings |
|
|
Wall Thickness /mm |
Tensile Strength σb≥/Mpa |
||
|
HT100 |
100 |
>2.5~10 >10~20 >20~30 >30~40 |
130 100 90 80 |
|
HT150 |
150 |
>2.5~10 >10~20 >20~30 >30~40 |
175 145 130 120 |
|
HT200 |
200 |
>2.5~10 >10~20 >20~30 >30~40 |
220 195 170 160 |
|
HT250 |
250 |
>4.0~10 >10~20 >20~30 >30~50 |
270 240 220 200 |
|
HT300 |
300 |
>10~20 >20~30 >30~50 |
290 250 230 |
|
HT350 |
350 |
>10~20 >20~30 >30~50 |
340 290 260 |
Castings Attached Specimen Tensile Strength Property
|
Gray Iron Grade |
Wall Thickness /mm |
Tensile Strength σb≥/Mpa |
Tensile Strength (reference) σb≥/Mpa |
|||
|
Attached Test Coupon |
Attached Test Block |
|||||
|
φ30mm |
φ50mm |
R15mm |
R25mm |
|||
|
HT150 |
>20~40 >40~80 >80~150 >150~300 |
130 115 - - |
- (115) 105 100 |
120 110 - - |
- - 100 90 |
120 105 90 80 |
|
HT200 |
>20~40 >40~80 >80~150 >150~300 |
180 160 - - |
- (155) 145 135 |
170 150 - - |
- - 140 130 |
165 145 130 120 |
|
HT250 |
>20~40 >40~80 >80~150 >150~300 |
220 200 - - |
- (190) 180 165 |
(210) 190 - - |
- - 170 160 |
205 180 165 150 |
|
HT300 |
>20~40 >40~80 >80~150 >150~300 |
260 235 - - |
- (230) 210 195 |
(250) 225 - - |
- - 200 185 |
245 215 195 180 |
|
HT350 |
>20~40 >40~80 >80~150 >150~300 |
300 270 - - |
- (265) 240 215 |
(290) 260 - - |
- - 230 210 |
285 255 225 205 |
Grey Iron Castings’ other mechanical property
|
Grade |
Compressive Strength σbc/MPa |
Shearing Strength τb/Mpa |
Impact Testing αKV/(J/cm2) |
Safe Range of stress σ-1/MPa |
Modulus of Elasticity Ε/GPa |
|
HT150 |
500~700 |
150~250 |
- |
60~90 |
70~90 |
|
HT200 |
600~800 |
200~300 |
2~5 |
80~90 |
80~110 |
|
HT250 |
800~1000 |
250~350 |
4~8 |
100~140 |
100~130 |
|
HT300 |
1000~1200 |
300~450 |
7~10 |
120~160 |
120~140 |
|
HT350 |
1100~1300 |
350~500 |
9~11 |
140~180 |
130~160 |
Grey Iron Castings Hardness
|
Gray Iron Grade |
Hardness Grade |
Hardness Range HBS |
Metallography |
|
HT100 |
H145 |
≤170 |
Ferrite |
|
HT150 |
H175 |
150~200 |
Ferrite + Pearlite |
|
HT200 |
H195 |
170~220 |
Pearlite |
|
HT250 |
H215 |
190~240 |
Pearlite |
|
HT300 |
H235 |
210~260 |
Pearlite(Inoculated Cast Iron) |
|
HT350 |
H255 |
230~280 |
Pearlite(Inoculated Cast Iron) |
Gray Iron Casting heat treatment
|
Casting Unit Weight kg |
Starting Temperature /οC |
Heating Speed /(οC/h) |
Preservation Temperature/οC |
Heat Preservation Time /h |
Cooling Speed /(οC/h) |
Final Temperature /οC |
|
|
Cast Iron |
Low Alloy Cast Iron |
||||||
|
Simple Castings |
|||||||
|
<200 |
≤200 |
≤100 |
500~550 |
550~570 |
4~6 |
30 |
200 |
|
200~2500 |
≤200 |
≤80 |
500~550 |
550~570 |
6~8 |
30 |
200 |
|
>2500 |
≤200 |
≤60 |
500~550 |
550~570 |
8 |
30 |
200 |
|
Precision Castings |
|||||||
|
<200 |
≤200 |
≤100 |
500~550 |
550~570 |
4~6 |
20 |
200 |
|
200~2500 |
≤200 |
≤80 |
500~550 |
550~570 |
6~8 |
20 |
200 |
Gray Iron Casting, no any standard mentioned the chemistry composition, so we only suggest the following chemistry based on actual production.
|
Grade |
Wall Thickness /mm |
C |
Si |
Mn |
P ≤ |
S ≤ |
|
HT100 |
- |
3.4~3.9 |
2.1~2.6 |
0.5~0.8 |
0.3 |
0.15 |
|
HT150 |
<30 30~50 >50 |
3.3~3.5 3.2~3.5 3.2~3.5 |
2.0~2.4 1.9~2.3 1.8~2.2 |
0.5~0.8 0.5~0.8 0.6~0.9 |
0.2 0.2 0.2 |
0.12 0.12 0.12 |
|
HT200 |
<30 30~50 >50 |
3.2~3.5 3.1~3.4 3.0~3.3 |
1.6~2.0 1.5~1.8 1.4~1.6 |
1.7~0.9 0.8~1.0 0.8~1.0 |
0.15 0.15 0.15 |
0.12 0.12 0.12 |
|
HT250 |
<30 30~50 >50 |
3.0~3.3 2.9~3.2 2.8~3.1 |
1.4~1.7 1.3~1.6 1.2~1.5 |
0.8~1.0 0.9~1.1 1.0~1.2 |
0.15 0.15 0.15 |
0.12 0.12 0.12 |
|
HT300 |
<30 30~50 >50 |
2.9~3.2 2.9~3.2 2.8~3.1 |
1.4~1.7 1.2~1.5 1.1~1.4 |
0.8~1.0 0.9~1.1 1.0~1.2 |
0.15 0.15 0.15 |
0.10 0.10 0.10 |
Carbon Steel Casting
Carbon steel have a good content of carbon, so it is easy to casting. especially A216 WCB.
It is important to clarify the meaning of carbon steel in the generic sense and in the more narrow context used in this report. The term steel is usually taken to mean an iron-based alloy containing carbon in amounts less than about 2%. Carbon steels (sometimes also termed plain carbon steels, ordinary steels, or straight carbon steels) can be defined as steels that contain only residual amounts of elements other than carbon, except those (such as silicon and aluminum) added for deoxidation and those (such as manganese and cerium) added to counteract certain deleterious effects of residual sulfur. However, silicon and manganese can be added in amounts greater than those required strictly to meet these criteria so that arbitrary upper limits for these elements have to be set; usually, 0.60% for silicon and 1.65% for manganese are accepted as the limits for carbon steel. Read more
Duplex Stainless Steel Compare
Duplex Stainless steel has two phase microstructure consisting of grains of Ferritic and Austenitic stainless steel. It is mainly used in pump fittings and oil field. We can produce SAF2205 DUPLEX STAINLESS STEEL.
duplex stainless steel compare.pdf
|
Index
|
USA
|
China
|
France
|
Germany
|
Japen
|
Sweden
|
England
|
|
1
|
UNS S31803
|
00Cr22Ni5Mo3N
|
UR 45N. UR45N+
|
W NR. 1.4462
|
DP8
|
SAF 2205 (SS2377)
|
|
|
2
|
UNS S31500
|
00Cr18Ni5Mo3Si2
|
W NR. 1.4417
|
DP1
|
3RE60 (SS2376)
|
||
|
3
|
UNS S32550
|
0Cr25Ni6Mo3CuN
|
UR 52N+
|
W NR. 1.4507
|
Ferralium 255
|
||
|
4
|
UNS S31200
|
00Cr25Ni6Mo2N
|
|||||
|
5
|
UNS S31260
|
00Cr25Ni7Mo3WCuN
|
W NR. 1.4501
|
DP3(SUS329J2L)
|
Zeron 100
|
||
|
6
|
UNS S32304
|
UR35N
|
W NR. 1.4362
|
DP11
|
SAF 2304 (SS2327)
|
||
|
7
|
UNS S32750
|
UR42N
|
W NR. 1.4410
|
SAF 2507
|
|||
|
8
|
UNS S32900
|
0Cr26Ni5Mo2
|
W NR. 1.4460
|
DP6(SUS329J1)
|
10RE51 (SS2324)
|
||
|
9
|
UNS S32950
|
Chinese Iron Casting
Cast Iron is individed to four types: gray iron, ductile iron, malleable iron, vermicular cast iron, abrasion-resistant cast iron and corrosion resistant cast iron.
Generally, we mainly use sand casting method to make iron castings, such as green sand casting, resin sand casting, Sodium silicate sand casting , lost foam casting and centrifugal casting.
Gray iron: HT150, HT200, HT250, HT300, HT350 ( refer to s Read more
ASTM A995/A995M for Castings, Austenitic-Ferritic (Duplex) Stainless Steel
ASTM A995/995M, Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts1
The duplex stainless steels offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not specified, but these grades will develop a range of approximately 30 to 60 % ferrite with the balance austenite. Read more
Duplex Stainless Steel Property
Duplex stainless steel castings, sorted by standard.
Duplex Stainless steel has two phase microstructure consisting of grains of Ferritic and Austenitic stainless steel. It has a better strength and corrosion resistance property than stainless steel 304/316. Duplex stainless steels have lower nickel and molybdenum contents than their austenitic counterparts of similar corrosion resistance.
