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Vol. 44 Supp. SCIENCE IN CHINA (Series A) August 2001

Research of cold-rolling oil for stainless sheet steel

QIN Henian

PetroChina Lanzhou Lubricating Oils Research and Develop Center, Lanzhou 730060, China

Received July 5, 2001Abstract The research & application of cold rolling oil for stainless sheet steel are introduced inthis paper. The results indicate that this oil has well properties of anti-wear, oxidation, emulsifyingand fine rust-preventing characteristics, it can meet the employable demands of SENDZIMIR highspeed rolling mill at all.

Keywords: cold rolling oil, stainless sheet steel, research.

1 Introduction

Stainless steel has higher strength and tend to splice roll easily in rolling process. So a lubri-

canting oil can be used to reduce friction and separate roll and sheet. The cold rolling oils for

stainless sheet steel is a metalworking oil with function of lubricating, cooling and washing. The

performance of the cold rolling oils have more strict demand, because of higher and higher rolling

speed and ratio with rapid development of metalworking industry. Stainless sheet steel surface is

demanded bright and the cold rolling use non water sol oils These oils comprises base oils se

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demanded bright and the cold rolling use non water sol oils These oils comprises base oils se

Supp. RESEARCH OF COLD-ROLLING OIL FOR STAINLESS SHEET STEEL 143

3 The results and the discussions

3.1 Main function of cold-rolling oil for stainless sheet steel and its performance demand

The first performance is lubrication. Stainless steel has higher strength and it is one of hard

working alloys. It tend to splice roll easy in rolling process. For these reasons , it has to use effec-

tive lubricant to reduce friction and separate sheet and roll in rolling process. Using lubricating oil

can increase rolling pressure and speed, reduce rolling numbers and rolling more thin sheet be-

cause of friction decrease. Another important action of this lubricating oil is cooling. Stainlesssteel has high hardness, and large heat can be produced in rolling process. Sheet and roll are very

easy spliced if they are not cooled in time. In addition, rolling oil has washing performance, it can

wash off the metal particles (or abrasion matter) and other stain on surface of sheet and roll in time,

therefore surface quality of steel plate can be ensured effectively. The rolling oils may be general

divided water soluble and non-water soluble. Non-water soluble rolling oils, comprising base oil

selected from mineral oils and/or fats, and oiliness additives and anti-oxidation additives, are use-ful for cold-rolling of metals which attach importance to appearance. Stainless sheet steel is useful

for manufacture of stainless steel products, and must have high surface quality, so the cold-rolling

oils is non-water soluble. The next sentence is discussion of main performance demands of the

cold-rolling oil for stainless sheet steel in service process.

(i) Viscosity

It can make thicker oil-film and have better lubricating action that high viscosity rolling

il d b t li g ff t i d lli g h t i t gl Thi i th t th high

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144 SCIENCE IN CHINA (Series A) Vol. 44

3.2 Draw up technical specifications

In Taiyuan Iron and Steel Complex of China, Mobil Genrex 26 is used for cold-rollingstainless sheet steel. According to the level and performance demands of the oil in useful process,

technical specifications of the product are drawn up in table1.

Table 1 The results of Genrex26 analyse and tentative technical norm

Item Mobil enrex26 Norm MethodsVicosity, 40 k mm 2/s 8.860 8.5 9.5 GB/T265

Vicosity Index 76 Report GB/T2541

Ash content m% 0.012 max 0.010 GB/T508

Acid value mgKOH/g 0.02 max 0.08 GB/T264

Colourity, No < 0.5 max 1.0 GB/T654

FP, k 159 min 155 GB/T3536

RBOT min 168 min 180 SH/T0193

PP, k -21 max 12 GB/T3535Copper corrosion level

100 k 3h T3 Cu )

1b max 1 GB/T5096

Anti-emulsifying degree

(40-37-3,ml) min

15.0 max 8.0 GB/T7305

Water-soluble

Acid and alkali

Not Not GB/T259

Four-ball test P B, N 441.0 min 392.0 GB/T3142Smell Less Less

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Supp. RESEARCH OF COLD-ROLLING OIL FOR STAINLESS SHEET STEEL 145

tent to reasonable, but high cost limit its application [3]. Hydrocracking oils have high saturated

hydrocarbon content and low aromatic content, well viscosity-temperature characteristics and palecolor etc., so they are ideal base oils.

Table 2 The base oil should meet functional requirements

Item Index Methods

Vicosity, 40 k mm 2/s 8.5 9.5 GB/T265

VI Min 80 GB/T2541

FP, k Min 155 GB/T3536

PP , k Max -12 GB/T3535

Mechanical impurites, m Not GB/T511

Water content, m Not GB/T260

Copper corrosion level

100 k 3h, T3 Cu )Max 1 GB/T5096

Acid value, mgKOH/g Max 0.02 GB/T264Water-soluble

Acid and alkaliNot GB/T259

Colourity, No Max 0.5 GB/T6540

Ash content, m Not GB/T508

Anti-emulsifying degree

(43-37-0,ml), minMax 5.0 GB/T7305

Table 3 Analytical results of distillation range of some oils

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146 SCIENCE IN CHINA (Series A) Vol. 44

ness lubricants shouldn't be used. Therefor, the anti-wear additives used for cold rolling oils for

stainless sheet steel must have characteristics of pale color, smell-less, low active and acid num-ber.

Ester oiliness additives are more used in cold rolling oils, to improve anti-wear property. The

result of anti-wear property of some ester oiliness additives, in same base oil and dose,is shown

in table 4. It can be seen that oiliness agent-1, oiliness agent-5 and oiliness agent-6 have better

anti-wear property. So they are used as main additive.

Table 4 The result of anti-wear property research of some agents

Number Oiliness additive Four ball P B,N AN,mgKOH/gZG-1 Oiliness agent-1 441.0 0.01

ZG-2 Oiliness agent-2 411.6 0.02

ZG-3 Oiliness agent-3 411.6 0.01

ZG-4 Oiliness agent-4 411.6 0.01

ZG-5 Oiliness agent-5 460.0 0.02ZG-6 Oiliness agent-6 460.0 0.02

Although oiliness agent-5 and agent-6 have better anti-wear propty, but worse

rust-preventing characteristic. Oiliness angent-1 has well rust-preventing characteristic, but it ef-

fects anti-emulsifying degree of the oil. For this reason, performances of anti-wear,

rust-preventing and anti-emulsifying are satisfied by complexing oiliness agent-5 and agent-1 oroiliness agent-6 and agent-1. Table 5 shows the research results of composite oiliness additives,

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Supp. RESEARCH OF COLD-ROLLING OIL FOR STAINLESS SHEET STEEL 147

Table 5 The research results of complex oiliness additive

Oiliness additives and dosage, wt%

Number Agent-1 Agent-5 Agent-6

(40-37-3,ml)

min

(A)

rust-preventing

ZG-7 0.2 0.4 3.7 Light

ZG-8 0.3 0.3 5.8 Light

ZG-9 0.4 0.2 7.0 Not

ZG-10 0.2 0.4 4.0 Light

ZG-11 0.3 0.3 4.5 Not

Table 6 Anti-oxidants and its anti-oxidation property

Number Anti-oxidant-1 Anti-oxidant-2 RBOT, minZG-20 4a 143

ZG-21 8a 169

ZG-22 2a 5b 235

ZG-23 3a 5b 270

ZG-24 3a 3b 270

3.5 Analyse and evaluate results of the products

By selection and mixing of additives & base oils, all analyse and evaluate results of final ex-

periment and industrial products are showed in table 7. It indicates that every characteristic meet

demand at all.Table 7 Tentative index and real analyse results of the products

Real analyse results

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