AISI 420 UNS S42000 Martensitic Stainless Steel Bars and plates
UNS S42000, is a martensitic stainless steel. It provides good hardness after heat treatment, moderate corrosion resistance in atmospheric, fresh water and weak corrosive environments. Compared with low-carbon martensitic stainless steel, UNS S42000 features higher carbon content, which can achieve high hardness up to HRC 50 and above through quenching and tempering. It is widely available in bar, plate, sheet and forging forms.
Applications of UNS S42000
UNS S42000 is commonly used for components requiring both hardness and general rust resistance. Typical applications include: cutlery, surgical & medical instruments, pump and valve parts, bearing components, plastic moulds, turbine parts, shafting, food processing machinery parts, as well as measuring tools and general wear-resistant mechanical parts.
Equivalent Grades and Commonly Used Specifications of UNS S42000
| Steel Grade | Specification | Steel Grade | Specification | Steel Grade | Specification | ||
|
2Cr13 / 20Cr13 / S42020 |
GB/T 1220 | 3Cr13/
30Cr13/ S42030 |
GB/T 1220 | 4Cr13/
40Cr13/ S42040 |
GB/T 1220 | ||
| GB/T 1221 | GB/T 4237 | GB/T 4237 | |||||
| GB/T 8732 | GJB 2294A | GB/T 4356 | |||||
| GB/T 4237 | UNS S42000 | ASTM A276/A276M | GJB 2294A | ||||
| GB/T 3280 | ASTM A240/A240M | UNS S42000/420 | ASTM A276/A276M | ||||
| GJB 2294A | 1.402 /X30Cr13 | EN 10088-2 | 1.4031/X39Cr13 | EN 10088-2 | |||
| UNS S42000/ 420 | ASTM A276/A276M | EN 10088-3 | EN 10088-3 | ||||
| ASTM A240/A240M | X30Cr13 | ISO 16143-1 | X39Cr13 | ISO 16143-1 | |||
| 1.4021 / X20Cr13 | EN 10088-2 | SUS420J2 | JIS G 4303 | ISO 16143-2 | |||
| EN 10088-3 | JIS G 4304 | 40X13 | GOST 5632 | ||||
| X20Cr13 | ISO 16143-1 | JIS G 4308 | / | ||||
| ISO 16143-2 | 30X13/30KX13 | GOST 5632 | |||||
| SUS420J1 | JIS G 4303 | / | |||||
| JIS G 4304 | |||||||
| JIS G 4308 | |||||||
| 20X13 | GOST 5632 | ||||||
| Produce as other form and size according to technical requirements are available. | |||||||
Typical Chemical Composition of UNS S42000
|
Specification |
Steel Grade | Elements% | ||||||
| C | Si | Mn | P | S | Ni |
Cr |
||
| ASTM A276 | UNS S42000 | ≥15.00 | 1.00 | 1.00 | 0.040 | 0.030 | / | 12.00~14.00 |
| GB/T 1220 | 2Cr13 | 0.16~0.25 | 1.00 | 1.00 | 0.040 | 0.030 | (0.60) | 12.00~14.00 |
| 3Cr13 | 0.26~0.35 | 1.00 | 1.00 | 0.040 | 0.030 | (0.60) | 12.00~14.00 | |
| 4Cr13 | 0.36~~0.45 | 0.60 | 0.80 | 0.040 | 0.030 | (0.60) | 12.00~14.00 | |
| JIS G 4303 | SUS420J1 | 0.16~0.25 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | ≤0.60 | 12.00~14.00 |
| SUS420J2 | 0.26~0.40 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | ≤0.60 | 12.00~14.00 | |
| EN 10088-3 | X20Cr13 | 0.16~0.25 | 1.00 | 1.50 | 0.040 | 0.030 | / | 12.00~14.00 |
| X30Cr13 | 0.26~0.35 | 1.00 | 1.50 | 0.040 | 0.030 | / | 12.00~14.00 | |
| X39Cr13 | 0.36~~0.42 | 1.00 | 1.00 | 0.040 | 0.030 | / | 12.50~14.50 | |
| Produce as other form and size according to technical requirements are available. | ||||||||
Typical Heat Treatment Condition and Mechanical Properties of UNS S42000
ASTM A276
| Specification | Steel Grade | Delivery Condition | Mechanical Properties of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J | HBW | HRC | |||
| ASTM A276 |
UNS S42000/ AISI 420 |
Annealed (Hot Finished) | / | / | / | / | / | ≤241 | / |
| Annealed (Cold Finished) | / | / | / | / | / | ≤255 | / | ||
| quenched ,for specimen thickness ≤9.5 mm（955℃, air) | / | / | / | / | / | / | ≥50 | ||
| Produce as other form and size according to technical requirements are available. | |||||||||
GB/T 1220
| Specification | Steel Grade | Delivery Condition | Mechanical Properties of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J | HBW | HRC | |||
|
GB/T 1220 |
2Cr13 | Annealed（800℃-900℃, cool slowly） | / | / | / | / | / | ≤223 | / |
|
Q+T（920℃-980℃, oil; 600℃-750℃, cool rapidly） |
≥440 | ≥640 | ≥20 | ≥50 | ≥63 | ≥192 | / | ||
|
3Cr13 |
Annealed （800℃-900℃, cool slowly） | / | / | / | / | / | ≤235 |
/ |
|
|
Q+T（920℃-980℃, oil; 600℃-750℃, cool rapidly） |
≥540 | ≥735 | ≥12 | ≥40 | ≥24 | ≥217 |
/ |
||
|
4Cr13 |
Annealed （800℃-900℃, cool slowly） | / | / | / | / | / | ≤235 | / | |
| Q+T（1050℃-1100℃ oil; 200℃-300℃, air） | / | / | / | / | / | / |
≥50 |
||
| Produce as other form and size according to technical requirements are available. | |||||||||
JIS G 4303
|
Specification |
Steel Grade | Delivery Condition | Mechanical Properties of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J | HBW |
HRC |
|||
|
JIS G 4303 |
SUS420J1 |
Q+T( 920～980℃,oil;600～750℃,cool rapidly) | ≥440 | ≥640 | ≥20 | ≥50 | ≥78 | ≥192 | / |
| Annealed ( 800～900℃ cool slowly;750℃ air | / | / | / | / | / | ≤223 |
/ |
||
|
SUS420J2 |
Q+T( 920～980℃,oil;600～750℃,cool rapidly) | ≥540 | ≥740 | ≥12 | ≥40 | ≥29 | ≥217 | / | |
| Annealed ( 800～900℃ cool slowly;750℃ air ) | / | / | / | / | / | ≤235 |
/ |
||
| Produce as other form and size according to technical requirements are available. | |||||||||
EN 10088-3
|
Specification |
Steel Grade | Delivery Condition | Mechanical Properties of Heat-Treated Specimens | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Zb/% | Aku2d/J | HBW |
HRC |
|||
|
EN 10088-3 |
X20Cr13 | Annealed | / | ≤760 | / | / | / | ≤230 | / |
| Q+T 700℃ | ≥500 | 700~850 | ≥13 | / | ≥25 | / |
/ |
||
|
Q+T 800℃ |
≥600 | 800 ~ 950 | ≥12 | / | ≥20 | / | / | ||
| X30Cr13 | Annealed | / | ≤800 | / | / | / | ≤245 |
/ |
|
|
Q+T 850℃ |
≥650 | 850 ~ 1000 | ≥10 | / | ≥12 | / |
/ |
||
|
X39Cr13 |
Annealed | / | ≤800 | / | / | / | ≤245 | / | |
| Q+T 800℃ | ≥650 | 800 ~ 1000 | ≥10 | / | ≥12 | / |
/ |
||
| Produce as other form and size according to technical requirements are available. | |||||||||
Product Forms and Size Range of UNS S42000
|
Product forms |
Size range |
|
Bars |
Diameter or side length: 5.0mm~1000mm |
| Flats |
thickness: 4.0mm~1000mm width: 300mm~2200mm |
| Produce as other form and size according to technical requirements are available. | |
