เมื่อเปรียบเทียบกับทรายซิลิกา ทรายโครไมต์สามารถหลีกเลี่ยงแท่งทรายส่วนใหญ่ในการหล่อได้ ดังนั้นจึงช่วยประหยัดค่าใช้จ่ายในการรักษาพื้นผิว นอกจากนี้ โครไมต์ยังสามารถรีไซเคิลได้หลายครั้งตามเทคโนโลยีต่างๆ
แอปพลิเคชัน
คุณสมบัติของทรายโครไมต์ช่วยให้สามารถใช้วัสดุในโรงหล่อเหล็กและเหล็กกล้าสีเทาที่มีงานสูงเป็นทรายสำหรับทำแกนและแม่พิมพ์ การนำความร้อนสูงทำให้มีคุณสมบัติในการทำความเย็นที่ดี การขยายตัวทางความร้อนต่ำทำให้มีความเสถียรในมิติที่ดี พื้นฐานที่ใกล้เคียงกับความเป็นกลางช่วยให้สามารถใช้ระบบการยึดติดเรซินและสารยึดเกาะอนินทรีย์ได้หลากหลาย โดยมีการหักเหของแสงสูงและการกระจายตะแกรงกว้าง
ทรายโครไมต์เหมาะสำหรับการหล่อเหล็กรวมถึงโรงหล่อเช่น:
น้อยกว่า 500KGS
|
500-1000KGS
|
1-10 ตัน
|
10-30 ตัน
|
30-100 ตัน
|
AFS40-70
|
เอเอฟเอส 45-50
|
เอเอฟเอส 45-50
|
AFS40-45
|
เอเอฟเอส 35-40
|
องค์ประกอบทางเคมี
|
|
Cr2O3
|
≥46.0%
|
SiO2
|
≤1.0%
|
น่าเกลียด
|
≤26.5%
|
CaO
|
≤0.3%
|
MgO
|
≤10%
|
AL2O3
|
≤15.5%
|
พี
|
≤0.003%
|
ส
|
≤0.003%
|
Cr/เฟ
|
1.55:1
|
คุณสมบัติทางกายภาพทั่วไป
|
|
ความแข็ง:
|
โมห์:5.5-6
|
จุดหลอมเหลว:
|
ประเสริฐที่ 2180℃
|
จุดหลอมเหลว:
|
>1800℃
|
เผา
|
1600℃
|
แรงดึงดูดเฉพาะ:
|
4.0-4.8 g/cm3
|
ความหนาแน่น (LPD):
|
2.5-3 ก./ซม.3
|
สี:
|
สีดำ
|
PH
|
7-9
|
เปอร์เซ็นต์ของกรดอิสระที่มีอยู่ในทราย
|
0%
|
ปริมาณกรด
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≤2ML
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เปอร์เซ็นต์ของดิน
|
≤0.1
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เปอร์เซ็นต์ความชื้น
|
≤0.1
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ขนาดที่มีจำหน่าย
|
|
AFS15-20, AFS15-25, AFS25-35, AFS25-30, AFS30-35, AFS35-40, AFS40-45, AFS45-50, AFS40-50, AFS50-55, AFS55-60, AFS60-65ขนาดที่กำหนดเองคือ เข้าถึงได้เมื่อมีการขอใช้
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