Wall Chart of Metallographic Rating Standards for Bearing Steel

1 Evaluation method for free carbides, pearlite, and Weibull structure of steel（GB/T13299-2022）

1. Free cementite rating

2 Pearlite Standard Rating

3 Wei's organization rating

8 sheets

2 Evaluation of banded structure in steel(Part One)（GB/T34474.1-2017）

A-series rating chart

B-series rating chart

C-series rating chart

D-series rating chart

E-series rating chart

5 sheets

3 Rating chart for determination of non-metallic inclusions content in steel(gb/t10561-2023)

ASulfides Fine series thickness

BAluminum carbide material Fine series thickness

CSilicates Fine series thickness

DCyclic oxides Fine series thickness

DSLarge particle spherical oxide

9Zhang

4 Metallographic examination of quenched medium carbon steel and medium carbon alloy structural steel （GB/T38720－2020）

1. Quenching microstructure

Microstructure of quenching+medium temperature tempering (450 ° C)

Microstructure of quenching+medium temperature tempering (600 ° C)

6 sheets

5 Standard rating chart for average grain size of metals（GB/T6394-2017)

1 Twin free grain (Shallow corrosion) 100times

2 Twinned grains (shallow corrosion) 100times

3 Twinned grains (deep contrast corrosion)75times

4 Austenitic grains in steel (carburizing method) 100times

12 sheets

6 Steel parts carburizing, quenching, tempering metallographic rating chart(GB/T25744--2010)

1Martensitic grade diagram for carburizing metallographic examination 2Zhang

2Grade diagram of residual austenite in carburizing metallographic examination 2Zhang

3Carbonization metallographic examination carbide grade diagram 3Zhang

4Carbonization metallographic examination of internal oxidation morphology 1Zhang

5Core microstructure level chart for carburizing metallographic examination 2Zhang

6Spark reference diagram of alloy steel 1Zhang

7Spark reference diagram for carbon steel 1Zhang

12Zhang

7 Metallographic Rating Standard Series Wall Chart

1. Fe-CandFe-Fe3CAlloy phase diagram

2. Fe-CandFe-Fe3CAlloy phase diagram and heat treatment temperature

3. Metallographic Rating Diagram for Induction Quenching of Steel Parts（110Grade)(JB/T9204-2008)

4 middleMartensitic Grade Diagram of Carbon Steel and Medium Carbon Alloy Structures（18Grade)(JB/T9211-2008)

5. Grade diagram of residual austenite and martensite in carburized gears（18）(QC/T262-1999)

6. Grade diagram of carbides in carburized gears （1-8Grade)

7. Nitride level diagram of nitriding layer on steel parts （1-5Grade)(GB/T11354-2005)

8. Steel grade spark identification chart

9. Conversion Table for Hardness and Strength of Carbon Steel and Alloy Steel

10. Comparison Table of Hardness of Metal Materials

17Zhang

8 Wall chart of metallographic rating standards for steel die forgings （GB/T13320-2007）

1 Normalized microstructure rating of medium carbon structural steel（1-8Grade)

2 Normalization organization rating of carburizing steel （1-8Grade)

3 Rating of quenched and tempered steel microstructure （1-8Grade)

8Zhang

9 Hanging chart of low and medium carbon steel spheroidization rating standards（JB/T5074--2007）

1 Rating of low carbon structural steel and low carbon alloy structural steel spheroidization

2 Rating of medium carbon structured steel spheroidization

3 Rating of medium carbon alloy structural steel spheroidization

3 sheets

10 Wall chart of metallographic grading standards for microstructure of tool steel

1 合金Microstructure rating of tool steel（GB/T1299-2000）

Pearlite structure

Mesh carbide grade

2 Rating of Large Carbides in High Speed Tool Steel（GB/T9943-2008）

First level diagram: Grade diagram of large angular carbides in tungsten based high-speed tool steel

Second level diagram: Molybdenum based high-speed tool steel wire large particle carbide level diagram

5Zhang

11 Hanging Chart of Microstructure Rating Standards for Mold Steel

1 Microstructure rating of hot work die steel（JB/T8420-2008）

2 Microstructure Rating of High Carbon and High Alloy Steel for Refrigeration Mold Steel（JB/T7713-2007）

8Zhang

12 Wall Chart of Metallographic Rating Standards for Bearing Steel

one rolling bearing Technical conditions for heat treatment of high carbon chromium bearing steel partsRating Wall Chart gb/t34891-2017

First level diagram Annealing tissue (magnification):1000X）

Second level diagram Quenching and tempering martensitic structure (magnification):1000X）

Third level diagram Quenched tempered martensite structure (magnification):500X）

Fourth level diagram Mesh like carbides (magnification):500X）

Fifth level diagram Bainite quenched microstructure (magnification):500X）

two Rolling bearing components Microstructure rating of carburizing heat treatment JB/T8881-2011

1 Coarse carbides in the carburized layer （1~3Grade)

2 Mesh like carbides in the carburized layer （1~4Grade)

3 Microstructure of carburized layer after high-temperature tempering （1~6Grade)

4 Microstructure of carburized layer directly quenched by carburizing（1~5Grade)

5 Microstructure of carburized layer after secondary quenching （1~5Grade)

6 Heart microstructure （1~4Grade)

11Zhang