process

The pickling process used at the present stage to remove the thick oxide skin on the surface of stainless steel, the use of high temperature, long pickling time, resulting in high processing costs; The process of removing the thin oxide skin at room temperature has a good effect on removing the thin oxide skin, but the effect on the thick oxide skin is not ideal, especially the black slag at the welding place can not be removed. In view of this situation, on the basis of summarizing the successful experience of stainless steel pretreatment, the author adopted two-step pickling comprehensive treatment technology, and successfully studied the rapid pickling process of stainless steel at room temperature. The process can quickly remove the thick oxide skin on the surface of stainless steel at room temperature, especially the black skin and inclusions at the welding place have good removal effect, and the surface is clean and bright after pickling treatment, not easy to lose light and fade, and not yellowing.

Pickling process flow

Stainless steel hanging - chemical degreasing (conventional alkaline chemical degreasing or surfactant oil removal) to hot water washing, water washing and pickling pickling to wash water, the second step the first step to wash water, into the next process (such as: chemical coloring to recycling, water washing to hardening treatment, water washing and closed to water washing and drying, finished goods)

The material: NES-M2021-2006 RP253-590

1. Suitable for pickling method of wire rod and semi-finished product drawing

Taking wire as an example, several common pickling processes are described. As for the semi-finished products after heat treatment, generally do not separate peeling rust is directly into the pickling. Other operation sequence is the same as wire.

(1) The process flow of pickling process based on shell stripping and lime paste is.

Wire → shell to rust → acid washing → water washing → high pressure water rinse → grease lime paste → drying

This process has been widely used in the past, and is suitable for the drawing of carbon steel wire, structural steel wire, steel core aluminum stranded wire, general spring steel wire blank and semi-finished products. The disadvantage is that there is a lot of dust, which has been replaced by other pickling processes.

(2) The pickling process based on peeling and rusting -- the process flow is.

Wire - peeling rust - acid - washing - high pressure water rinse - rust - stained with thin lime - dry

This kind of drawing dust less, is a more used at present. It is suitable for general carbon steel wire, structure steel wire, rope steel wire, steel core aluminum stranded wire, general spring steel wire and other blank and semi-finished drawing. Some units also leave out rust chemical sequence, wash directly with ash.

(3) to shell, phosphating based pickling process.

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