Factors Influencing Stainless Steel Mesh Belt Material Selection for Heat Treatment Quench Oil Tanks

Combined with heat treatment on-site operating characteristics, the selection of mesh belt alloy grade is restricted by five core practical factors, detailed as below:

1. Workpiece inlet temperature & cyclic thermal shock intensity

It is the primary decisive factor for material high-temperature resistance of quenching stainless steel mesh belt. Hot workpieces directly drop from heating furnace into quenching oil, creating drastic temperature alternation from 700~1050℃ down to 40~90℃ instantly.

• Low inlet temperature (＜600℃): 304 stainless steel mesh belt meets basic usage;

• Medium temperature (600~750℃): Thermal sensitization risk rises, prefer 316L stainless steel mesh belt;

• High temperature (＞800℃): Severe thermal fatigue and high-temperature creep happen, must adopt 310S/314 heat-resistant stainless steel mesh belt.Long-term frequent cold-hot cycling will accelerate intergranular precipitation of alloy, making ordinary stainless steel net strip prone to cracking.

2. Corrosion performance of quenching oil medium

Quench oil gradually deteriorates after long service, generating organic acid, sulfide, chloride impurities from workpiece oxide scale and decomposed base oil, which directly determines the anti-corrosion grade of oil tank conveyor mesh belt.

1. Fresh, regularly replaced clean quenching oil: Weak corrosivity, cost-effective 304/316L mesh belt is feasible;

2. Aging oil with infrequent replacement, high acid & sulfur content: Molybdenum-containing 316L mesh belt or high-alloy 310S mesh belt is required to resist pitting and intergranular corrosion;

3. Special synthetic quenching liquid with strong ester corrosion: Duplex stainless steel mesh belt is optional for customized working conditions.

3. Continuous production load and daily operation duration

Running load is a key index for service life assessment of heat treatment furnace mesh belt:

• Intermittent production (daily working less than 8 hours, discontinuous feeding): Low fatigue loss, 304 stainless mesh belt can control procurement cost;

• 24-hour non-stop full-load continuous quenching line: Repeated tensile and impact abrasion, high creep resistance alloy (316L / 310S mesh belt) is necessary to shorten shutdown maintenance frequency;

• Heavy stacked large workpieces: Additional wear load accelerates wire thinning, higher-grade stainless steel conveyor mesh belt is preferred over cheap low-alloy steel.

4. Furnace process atmosphere type

Different heat treatment techniques change oil corrosive composition indirectly and affect the final choice of high temperature resistant mesh belt:

• Ordinary quenching in air atmosphere: Mild oil pollution, conventional stainless steel mesh belt works;

• Carburizing, carbonitriding production line: Furnace carburizing medium dissolves into oil to form corrosive organic matter, requiring anti-carburization 314 or 310S mesh belt instead of 304/316L.

5. Comprehensive cost budget and total operation cost control

Cost planning largely guides manufacturers’ final decision on quench tank stainless steel mesh belt specification:

1. Initial purchase cost: 304 mesh belt＜316L mesh belt＜310S mesh belt＜duplex steel mesh belt, small-scale intermittent processing factories tend to choose low-cost grades for upfront expense saving;

2. Long-term comprehensive cost: Though high-alloy materials cost more at purchase, their longer service life reduces frequent belt replacement cost and production halt loss. Large automotive, bearing heat treatment manufacturers usually select 310S heat-resistant mesh belt to cut overall annual operating expenditure.

Supplementary minor influencing factor

Mesh weaving structure and wire diameter design match material selection: Fine mesh for tiny precision parts and thick-wire reinforced mesh for heavy forging pieces will further adjust the final alloy specification of industrial stainless steel mesh belt.