Introduction to the hardness requirements of grey iron castings for motor vehicles

Gray iron castings are commonly used in general engineering applications, primarily for their tensile strength. These castings are classified based on the tensile strength of different casting bars. Specifically, gray iron castings used in motor vehicles are designed for sand casting and are widely applied in automotive, tractor, and related industries. One important factor to consider is the hardness requirements for these castings. When placing an order, the contract should include several key details: - Whether special heat treatment is required. - The specific surface where the hardness test will be conducted. - The desired surface hardening depth and surface hardness. For gray iron castings used in motor vehicles, the foundry must implement proper control and inspection methods to ensure that the casting meets the specified hardness range. Brinell hardness testing is performed according to ASTM E10 standards after removing a sufficient thickness from the surface to ensure accurate readings. Unless otherwise agreed, a 10 mm steel ball and a 3000 kg load are typically used. The area and location of the hardness measurement should be agreed upon between the supplier and buyer and clearly marked on the drawing. The relationship between gray iron grades, hardness ranges, and Brinell indentation diameter (BID) is outlined below: | Brand | Hardness Range and Brinell Indentation Diameter | Description | |----------|--------------------------------------------------|---------------------| | G1800 | HB187 max, 4.4 BID min or by agreement | Ferrite - pearlite | | G2500 | HB170–229, 4.6–4.0 BID or by agreement | Pearlite - ferrite | | G3000 | HB187–241, 4.4–3.9 BID or by agreement | Pearlite | | G3500 | HB207–255, 4.2–3.8 BID or by agreement | Pearlite | | G4000 | HB217–269, 4.1–3.7 BID or by agreement | Pearlite | For heavy-duty brake hubs and clutch friction plates, the following grades and hardness specifications apply: | Brand | Carbon, minimum (%) | Casting Hardness and Indentation Diameter | |-------------|---------------------|-------------------------------------------| | G2500a | 3.40 | HB170–229, 4.6–4.0 BID or by agreement | | G3500b | 3.40 | HB207–255, 4.2–3.8 BID or by agreement | | G3500c | 3.50 | HB207–255, 4.2–3.8 BID or by agreement | Note: For alloy gray iron motor camshafts, the grade is G4000d. The hardness is determined by mutual agreement, with the support surface hardness ranging from 241–2321 HB. Understanding the hardness requirements is essential to ensuring the performance and durability of gray iron castings in automotive applications. Proper selection of material and adherence to testing standards can help avoid potential issues during use. Always consult with your supplier to confirm all specifications before finalizing any order.

Room Door

All aluminum alloy material has strong plasticity and never rusts. Fluorocarbon baking powder is delicate, smooth, and long-lasting without fading. The product is intelligently matched with various smart devices, making it a minimalist, luxurious, and youthful fashion design style.

Advantages of aluminum doors:
Strong and durable: Aluminum alloy has high strength and hardness, can withstand the collision and wear in daily use, and has a long service life.
Corrosion resistance: Aluminum will naturally form an oxide film in the air. This oxide film can effectively prevent aluminum from further oxidation and corrosion, making it stable and not easily damaged in environments such as moisture, acid and alkali.
Good fire resistance: Aluminum alloy has good high temperature resistance, which can play a role in fire prevention to a certain extent and increase the safety of living.
Good sealing: Aluminum doors can be equipped with high-quality sealing strips to effectively improve the sealing performance of the door, and have significant sound insulation, heat insulation, and dustproof effects.
Various styles: Through different surface treatment processes and designs, a variety of colors and styles can be achieved to meet different decoration styles and personal preferences.
Environmental protection: Aluminum is a recyclable material and conforms to the concept of environmental protection.

aluminum room door, soundproof interior doors,aluminum door for comfort room,wood room door,interior wood doors

Foshan Nanhai Jinfancheng Metal Building Materials Products Co., Ltd. , https://www.landrandoor.com