SU1514819A1 - Castable steel - Google Patents

Abstract

The invention relates to metallurgy, in particular to low-alloyed steels for the manufacture of large grades of yellow loaded automotive castings, which are subject to increased requirements for operational reliability. The purpose of the invention is to increase the strength and toughness in castings up to 150 mm thick after normalization. Steel additionally contains molybdenum and cobalt in the following ratio, wt.%: Carbon 0,25-0,35

silicon 0,2-0,5

manganese 0.4-0.9

chromium 0.4-0.6

vanadium 0.06-0.15

nickel 0.5-0.8

aluminum 0.01-0.05

cerium 0,001-0,05

calcium 0,005-0,05

molybdenum 0,2-0,4

cobalt 0.05-0.15

iron else. The higher strength properties and toughness of the proposed steel in comparison with the known steel allow to increase the reliability and operational durability of the products. 2 tab.

Description

The invention relates to metallurgy, in particular, to the composition of low-alloyed cast steel, and can be used for the manufacture of large, heavy-toned automobile castings, which are subject to increased requirements for operational reliability.

The purpose of the invention is to increase the strength and toughness in castings up to 150 mm thick after normalization. of

The chemical composition of the proposed and known steels is given in Table 1.

The steel was smelted in an acid lined high frequency induction furnace.

I Metaples after deacidification and modification at 1620-1650 ° C were poured into molds from cold hardening mixtures to obtain a heading in the form of plates with a thickness of 150 mm, from which samples were cut to study the mechanical properties of steel. The resulting blanks were first normalized by heating to 900 ° C, holding for 6 hours, followed by cooling in air, and then discharging by heating to 550 ° C, holding for 4 hours and cooling in air.

Mechanical properties are offered. My and famous steels on standard samples are given in table 2.

SP

4ib

00

WITH

3151481

Higher strength properties and impact toughness of the proposed Steel compared to the well-known pos94

additionally contains molybdenum and cobalt in the following ratio, wt.%:

Previous- 1 680 490 24 4,6 loga- 2 720 530 22 4.8 ma 3 760 540 20 3.8

Known 4

650

Table 2

450

20

3.2

Claims (1)

Claim Foundry steel containing carbon Dod, silicon, manganese, chromium, vanadium, diium, nickel, aluminum, cerium, calcium, iron, different Dem, which, in order to increase the strength _l Impact strength in castings with a thickness of 15 to 150 mm after normalization, it additionally contains molybdenum and cobalt in the following ratio of components, wt.%: Carbon 0.25-0.35 Silicon 0.2 -0.5 Manganese 0.4 -0.9 Chromium 0.4-0.6 Vanadium 0.06-0.15 Nickel 0.5 -0.8 Aluminum 0.01-0.05 Cerium 0.001-0.05 Calcium • 0.005-0.05 Molybdenum. 0.2 -0.4 Cobalt 0.05-0.15 Iron Rest Table 1 If Chemical composition, wt.% Steel swimming trunks C | Si 1 megapixel SG 1 ^v Ni 1 mo 1 Co 1 ^ai Xie Sa | Mg 1 ^Fe ----- L · ——--- 1_______ _______ '_______1_____ .1________ Offering 1 0.25 0.2 0.4 0.4 0.06 0.5 0.2 0.05 0.01 0.001 0.005 Rest may 2 0.31 0.36 0.67 0.51 0.11 0.68 0.33 0.12 0,026 0.02 0.02 - Rest Known 3 0.35 0.5 0.9 0.6 0.15 0.8 0.4 0.15 0.05 0.05 0.05 Rest naya 4 0.26 0.52 0.83 0,4,4 0.14 0.65 - - 0.05 0.05 0.02 0.02 The rest is new Proposed Table 2 Mechanical properties Impact strength Xie MPa Sz MPa 1 1 ii! ⁰⁵ 1 1 “1 1 1 1 KCU, MJ / m ² 680 490 24 4.6 720 530 22 4.8 760 540 20 3.8 Famous 4 650 450 20 3.2