Product Introduction

FGS700-2 lost wax investment casting of ductile iron

Product introduction

Material name: ductile iron

Scope of application

It is pearlescent ductile iron with high strength, wear resistance and low toughness (low plasticity). Suitable for high strength requirements of parts, such as diesel and gasoline engine crankshaft, camshaft, part of the grinder, milling machine, lathe spindle, ball mill shaft, small turbine spindle.

Chemical composition

C: 3.08 ~ 3.30

Silicon: 2.49 ~ 3.13

Manganese Mn: 0.55 ~ 0.61

Sulfur S: 0.017 ~ 0.022

P: 0.045 ~ 0.052

Mechanical property

Tensile strength σb (MPa) : ≥700

Conditional yield strength σ0.2 (MPa) : ≥420

Elongation δ (%) : ≥2

Hardness: 225 ~ 305HB

Heat treatment specifications and metallographic structure

Heat treatment specification: (determined by the supplier, the following is the heat treatment specification of a sample, for reference) 800℃, normalizing

Metallographic structure: graphite + pearlite + a small amount of ferrite

The mechanical properties of ductile iron are based on two indexes: tensile strength and elongation. Under the condition of stable production process, acceptance can also be carried out according to the hardness value. Because the corresponding relationship between hardness and strength is established on the basis of qualified spheroidization, chemical composition, inoculation stability, and reasonable casting process, in order to ensure the performance, it is stipulated that the metallographic structure must be tested when accepting according to the hardness, and the spheroidization rate shall not be less than 4. Even if the hardness and spheroidization are qualified, the strength and toughness may not meet the requirements due to the presence of cementite, phosphorus eutectic and high silicon solution strengthening in the matrix. Therefore, without the stable conditions of the production process, it can not be accepted according to the hardness value.

Zhongwei Precision has the following services

Detection Systems

Copper Silica Sol Investment Casting

We are the manufacturer of "FGS700-2 Ductile iron castings", if you need more information please contact us!