In inquiries about stainless steel precision casting, customers often ask: Why do some quotes use "silica sol" while others use "water glass" for lost-wax casting? This isn't just a simple difference in terminology; the shell material, dimensional stability, surface quality, post-processing costs, and suitable products are completely different. Choosing the wrong process can lead to anything from larger machining allowances and more surface rework to failing to meet dimensional and airtightness requirements. In short: The core difference between the two processes is that the silica sol process uses silica sol as a binder, resulting in better shell strength and thermal stability, and a finer shell surface, making it suitable for castings with high requirements for dimensional accuracy, surface roughness, and material consistency. The water glass process uses water glass as a binder, resulting in lower process costs and a relatively shorter production cycle, making it more suitable for medium to large castings with simpler structures, less demanding surface finishes, and requiring extensive machining or sandblasting for corrosion protection. A table comparing silica sol and water glass can help you understand the differences.

2520 (310S) high-temperature resistant stainless steel castings are suitable for furnace tooling, heat treatment trays, and high-temperature equipment accessories. This article compares 304, 316, and 309S materials to explain the high-temperature advantages, application scenarios, and selection considerations of 310S.

In procurement drawings, quality reports, or surface treatment requirements for precision casting and CNC machined parts, terms such as Ra, Ry, Rz, and polishing level are frequently seen. While all related to surface finish, they are not the same concept. Choosing the wrong indicator may result in parts that, although "looking shiny," fail in sealing, fit, wear resistance, or coating adhesion. This article, starting from the practical applications of stainless steel precision casting and CNC machining, compares surface roughness indicators, common polishing states, metal wear risks, and subsequent surface treatment selection strategies. I. Surface Finish and Roughness: Surface finish cannot be judged solely by "shine." Surface finish is a common description of surface smoothness and fineness; engineering acceptance typically quantifies it using surface roughness parameters, usually in μm. Lower roughness generally indicates lower microscopic peaks and valleys, but a mirror-like appearance does not necessarily represent a critical functional surface…

This document summarizes the correspondences between common ISO, DIN, GB/T, and ASME/ANSI standards for hex bolts, nuts, socket head cap screws, washers, and set screws, and introduces key points for selecting stainless steel fasteners.

Brushed polishing emphasizes aesthetics and ease of maintenance, while mirror polishing highlights brightness and display effect. This article compares the appearance, maintenance, processing, and applicable scenarios of these two stainless steel surface treatments to help projects choose the right one.

From material selection, factory inspection, first article confirmation to packaging, shipping and export documents, this guide systematically outlines the key steps and risk control methods for overseas buyers procuring stainless steel products from China.

Stainless steel is not absolutely rust-proof. This article explains the causes of rust spots, pitting corrosion, and crevice corrosion, compares the application environments of 201, 304, 316L, 2205, and 2507 stainless steel, and summarizes the key points for material selection and rust prevention of stainless steel castings.

In the procurement of stainless steel products, precision castings, machined parts, or industrial components, a metal material grade comparison table is often the first step in communication. The same material might be written as 06Cr19Ni10 in Chinese drawings, 304/S30400 in the US, and 1.4301 in European documents. Without clarifying the standard system and product form, discrepancies may occur in pricing, material selection, and quality acceptance. This article compiles common comparison relationships for common metal materials in GB/T, ASTM/UNS/SAE/AA, EN/DIN, and JIS systems, covering stainless steel, carbon steel and alloy steel, cast steel and stainless steel castings, aluminum alloys, copper alloys, titanium alloys, and nickel-based alloys, facilitating quick retrieval during procurement inquiries, drawing reviews, and initial material selection. Usage reminder: The same row in the table below indicates similar grades or applications frequently compared in engineering procurement…

Haijin Stainless Steel undertakes the customization of precision castings of 2520 and 310S heat-resistant steel, suitable for heat treatment tooling, furnace accessories, pumps and valves, and non-standard high-temperature mechanical parts.