制作方法：
水洗 磁選密度（kg/m3）：
4-4.8純度：
46%莫氏硬度：
5.5-6白度：
1%目數(shù)：
AFS 40-50品級：
鑄造級別主成分含量（%）：
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防止鑄鋼件收縮變形用鉻礦砂AFS40-50低硅高鉻
鉻礦砂AFS 40-50(Chromite sand AFS 40-50)是一種黑色、具有半金屬光澤得鑄造砂。它來自于自然界中的鉻鐵礦。鉻礦砂莫氏硬度5.5-6.5，比重4.3-4.8g/cm3。天然的鉻鐵礦石由尖晶石和脈石相兩部分組成，兩者通常是伴生的。尖晶石為 Mg·FeO Al Cr2O3,脈石為蛇紋石 H4 Fe·Mg3 Si2O9（水化硅鎂），鉻礦石中還有少量的鎂橄欖石、石英、綠輝石等形態(tài)。其中的石英(SiO2）對鑄造用的鉻礦砂是有害的，需要通過加工手段去除。
Chromite sand AFS 40-50 is a black casting sand with a semi metallic luster. It comes from chromite ore in nature. Chromite sand has a Mohs hardness of 5.5-6.5 and a specific gravity of 4.3-4.8g/cm3. Natural chromite ore is composed of two parts: spinel and gangue, which are usually associated. Spinel is Mg ? FeO Al Cr2O3, gangue is serpentinite H4 Fe ? Mg3 Si2O9 (hydrated silicon magnesium), and there are also small amounts of magnesium olivine, quartz, green pyroxene and other forms in chromite. The quartz (SiO2) in it is harmful to the chromite sand used in casting and needs to be removed through processing methods.
鉻礦砂AFS 40-50(Chromite sand AFS 40/50)的性能特點
(1)鉻鐵礦鑄造砂Chromite sand具有優(yōu)良的激冷特性，這種特性不減少熱裂，但能影響溫度梯度，促進方向性凝固而不需用冷鐵。這個特性對大型厚壁鑄件很重要，它可以促進鑄件按順序凝固，減少氣孔缺陷。
(2)鉻礦砂Chromite ore sand是惰性的，因而不和其它金屬氧化物發(fā)生反應(yīng)。它不被錳鋼水潤濕。錳鋼鑄件能很成功的使用鉻鐵礦砂。如果鑄型是正常地刷涂料并且氧化硅含量低，則沒有鐵橄石反應(yīng)。
(3)鉻鐵礦砂的線膨脹小，而線膨脹是一個可能引起夾砂鑄件的因素。因此它可能用來混制大型鑄件用的濕砂型。
(4)鉻礦砂Chromite sand通過細粒燒結(jié)，伴隨著激冷作用和高殘留熱強度，消除了金屬滲透，減少了化學粘砂的風險。
(5)鉻鐵礦砂兼容性強，它可與各種粘結(jié)劑共同使用，同時它可屬于某一的粒度范圍。鉻礦砂還可以與硅砂混合使用。
(6)鉻鐵礦砂的硅含量低，清理鑄造砂時可以減少硅粉塵的攝入，不會對人體產(chǎn)生健康影響。
(1) Chromite sand for steel casting has excellent quenching properties, which do not reduce hot cracking but can affect temperature gradients and promote directional solidification without the need for cold iron. This characteristic is important for large thick walled steel castings. Chromite sand can promote sequential solidification and reduce porosity defects.
(2) Chromite ore sand is inert and therefore does not react with other metal oxides. It is not wetted by manganese steel water. Manganese steel castings can successfully use chromium iron ore sand. If the mold is coated normally and the silicon oxide content is low, there is no iron olivine reaction.
(3) The thermal expansion of chromite sand is small. Linear expansion is a factor that may cause sand inclusion in castings. Therefore, it may be used to mix wet sand molds for large castings.
(4) Chromite sand is sintered through fine-grained sintering, accompanied by quenching and high residual heat strength, eliminating metal penetration and reducing the risk of chemical sand sticking.
(5) Chrome ore sand has strong compatibility and can be used together with various binders, while also belonging to a certain particle size range. Chromite sand can also be mixed with silica sand for use.
(6) The silicon content of chromite sand is low, and cleaning the casting sand can reduce the intake of silicon dust, which will not have a health impact on the human body.
鉻礦砂AFS 40-50(Chromite sand AFS 40/50)的技術(shù)參數(shù)：
1. 化學成分
Cr2O3 （三氧化二鉻） | ≥ 46% |
SiO2（二氧化硅） | ≤ 1.0% |
FeO（氧化鐵） | ≤ 26.5% |
Cr：Fe （鉻鐵比） | ≥1.5：1 |
MgO（氧化鎂） | ≤ 10% |
CaO（氧化鈣） | ≤ 0.3% |
Al2O3（三氧化二鋁） | ≤ 15.5% |
P（磷） | ≤30 ppm |
S（硫） | ≤30 ppm |
Cr/Fe（鉻鐵比） | ≥ 1.55：1 |
2.物理性能：
莫氏硬度（Mohs Hardness） | 5.5-6 |
熔點（Melting Point） | 2180 ℃ |
燒結(jié)溫度（Sintering Point） | ＞1800℃ |
比重（Specific Gravity） | 4.0-4.8 g/cm3 |
堆積密度 (Bulk Density LPD) | 2.5-3 g/cm3 |
顏色（Color） | 黑色（Black） |
PH值（PH Value） | 7-9 |
導熱系數(shù)（Thermal conductivity） | 0.63 W/M·K |
熱膨脹率（Thermal Expansion Rate）（1000℃） | 0.6% |
酸耗值（Acid Demand Value ADV） | ≤ 5ML |
渾濁度（turbidity）(JTU) | ≤ 110 |
含泥量（Soil content） | ≤ 0.1% |
含水量（Moisture） | ≤ 0.1% |
鉻礦砂AFS 40-50(Chromite sand AFS 40/50)的應(yīng)用范圍：
1. 大型厚壁型鑄件鑄造：鉻礦砂配合砂型鑄造、呋喃樹脂自硬砂、水玻璃自硬砂等工藝，用于體積重量大的鑄鐵件和鑄鋼件，可以使鑄件按既定的順序進行冷卻，有利于提高鑄件內(nèi)部的緊密度，增強鑄件的強度。此外，對于使用硅砂的工藝，可在容易出現(xiàn)氣孔、脈紋的關(guān)鍵部位，使用鉻礦砂作為面砂代替硅砂，可以有效防止裂紋、氣孔等鑄造缺陷。
2. 消失模鑄造。在消失模鑄造中，選用鉻礦砂，可以防止石英砂鑄造造成的夾砂、粘砂等缺陷。用于制造高鉻鑄鋼、高錳鋼材質(zhì)的閥門、葉輪等鑄件。
3. 殼型鑄造：鉻礦砂可用于殼型鑄造中復雜部件的芯砂材料，制作砂芯。用于生產(chǎn)高精度、表面光滑的304，316不銹鋼鑄件和碳鋼精密鑄件等，可以有效防止鑄件內(nèi)腔的粘砂問題。
4. 砂型鑄造：鉻砂還可以用于砂型鑄造，如型砂鑄造、水玻璃自硬砂砂型鑄造等，用于生產(chǎn)各種大中小型零件，如泵體、管道、閥門等。
1. Large scale thick walled casting: Chromite sand combined with sand casting, furan resin self hardening sand, water glass self hardening sand and other processes are used for large volume and weight cast iron and steel castings. It can cool the castings in a predetermined order, which is conducive to improving the internal tightness of the castings and enhancing their strength. In addition, for the process of using silica sand, chromite ore sand can be used as surface sand instead of silica sand in key areas where porosity and veins are prone to occur, which can effectively prevent casting defects such as cracks and porosity.
2. Lost foam casting. In lost foam casting, using chromite sand can prevent defects such as sand inclusion and sticking caused by quartz sand casting. Used for manufacturing castings such as valves and impellers made of high chromium cast steel and high manganese steel materials.
3. Shell casting: Chromite sand can be used as a core sand material for complex components in shell casting, making sand cores. Used for producing high-precision, smooth surface 304316 stainless steel castings and carbon steel precision castings. It can effectively prevent the problem of sand sticking in the inner cavity of castings.
4. Sand casting: Chromite sand can also be used for sand casting, such as sand casting, water glass self hardening sand casting, etc., to produce various large, medium, and small parts, such as pump bodies, pipelines, valves, etc.
鉻礦砂AFS 40-50(Chromite sand AFS 40/50)的粒度分布如下：
+30mesh(600um) | 1.60 |
+40mesh(425um) | 22.00 |
+50mesh(300um) | 34.50 |
+70mesh(212um) | 32.90 |
+100mesh(150um) | 9.00 |
AFS細度值 | 43.47 |
鉻礦砂Chromite sand的其他型號：
國內(nèi)常規(guī)粒度：10-20目 20-40目，20-60目，30-70目，40-70目，50-100目、70-140目，140-270目 0-1mm 200目，325目,400目，70#-0
出口常規(guī)粒度：AFS 25-35 AFS 25-30 AFS 30-35 AFS 35-40 AFS 40-45 AFS 45-50 AFS 40-50 AFS 50-55 AFS 55-60 AFS 60-65 0-1mm 200# 325#,400#
南非進口鉻礦砂，國內(nèi)加工，低硅高鉻，適用于鑄造
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