X20Cr13 / 1.4021 Stainless Round Bar | AISI 420 Reference Martensitic Steel
PRODUCT DESCRIPTION
X20Cr13 / 1.4021 is a hardenable martensitic stainless steel combining moderate corrosion resistance with mechanical strength and wear resistance. Saf Çelik evaluates the grade in certified hot-rolled and peeled round-bar form.MATERIAL INFORMATION
X20Cr13 / 1.4021 Stainless Round Bar
X20Cr13, material number 1.4021, is a martensitic stainless steel containing approximately 12–14% chromium. Its hardenability makes it suitable for mechanical components that require strength, wear resistance and moderate corrosion resistance.
The grade may be referenced internationally as AISI 420 or UNS S42000. These designations do not create automatic certificate equivalence. The specified material number, product standard, delivery condition, chemical analysis and EN 10204 certification requirement must be defined for every order.
Saf Çelik evaluates X20Cr13 in hot-rolled, peeled round-bar form. Available diameter, length, delivery condition and certification status must be confirmed during quotation.
Principal Designations
| Item | Information |
|---|---|
| Steel grade | X20Cr13 |
| Material number | 1.4021 |
| Steel family | Martensitic stainless steel |
| Searchable international references | AISI 420, UNS S42000 |
| Product form | Hot-rolled, peeled round bar |
| Typical delivery conditions | Annealed or quenched and tempered |
| Reference standard | EN 10088-3 |
Chemical Composition
| Element | X20Cr13 / 1.4021 (%) |
|---|---|
| Carbon (C) | 0.16 – 0.25 |
| Silicon (Si) | max. 1.00 |
| Manganese (Mn) | max. 1.50 |
| Phosphorus (P) | max. 0.040 |
| Sulphur (S) | max. 0.030 |
| Chromium (Cr) | 12.00 – 14.00 |
EN 10204 3.1 Certified Heat Analysis
The following cast analysis is taken from an EN 10204 3.1B certificate retained in Saf Çelik records. The documented material was Ø65 mm, 6 m long, hot-rolled and peeled round bar. These values apply only to that specific heat.
| Element | Heat analysis (%) |
|---|---|
| Carbon (C) | 0.20 |
| Silicon (Si) | 0.83 |
| Manganese (Mn) | 0.46 |
| Phosphorus (P) | 0.028 |
| Sulphur (S) | 0.024 |
| Chromium (Cr) | 12.56 |
| Nickel (Ni) | 0.24 |
| Molybdenum (Mo) | 0.07 |
| Aluminium (Al) | 0.028 |
| Copper (Cu) | 0.11 |
| Vanadium (V) | 0.03 |
| Tungsten (W) | 0.05 |
| Titanium (Ti) | 0.005 |
| Cobalt (Co) | 0.014 |
| Niobium (Nb) | 0.01 |
| Nitrogen (N) | 0.023 |
| Tin (Sn) | 0.02 |
Mechanical Test Results Recorded on the Certificate
The certificate identifies the product delivery condition as annealed. The mechanical test results below belong to the heat-treated test specimen specified on the certificate and must not be treated as an automatic delivery guarantee for annealed stock.
| Property | Required value | Certificate test result |
|---|---|---|
| Yield strength Rp0.2 | ≥ 500 MPa | 585 MPa |
| Tensile strength Rm | 700 – 800 MPa | 754 MPa |
| Elongation A5 | ≥ 13% | 26% |
| Brinell hardness | max. 230 HB | 207 HB |
| Impact energy KV | ≥ 25 J | 70 J |
Delivery Condition and Reference Properties
| Delivery condition | Reference property |
|---|---|
| Annealed (+A) | For round bars, approximately max. 760 MPa tensile strength and max. 230 HB hardness |
| QT 700 | Rp0.2 ≥ 500 MPa; Rm 700 – 850 MPa; A5 ≥ 13%; KV ≥ 25 J |
| QT 800 | Rp0.2 ≥ 600 MPa; Rm 800 – 950 MPa; A5 ≥ 12%; KV ≥ 20 J |
Corrosion Resistance, Machining and Welding
X20Cr13 offers moderate corrosion resistance typical of martensitic stainless steels. It can be suitable for atmospheric service, mild humidity, selected organic acids and moderately corrosive chloride-free environments. It must not automatically be selected for seawater, high-chloride environments, strong acids or uncleaned heat-affected zones after welding.
In annealed condition, X20Cr13 can be machined by turning, milling, drilling and grinding. Where higher strength or hardness is required, most machining should be completed before heat treatment, followed by final grinding where necessary.
Welding of martensitic stainless steel requires careful procedure selection. Suitable filler metal, preheating, controlled cooling, post-weld heat treatment and surface cleaning must be evaluated for the actual component and service environment.
Typical Applications
- Pump, valve and fluid-handling components
- Stainless shafts, pins, bushes and connection parts
- Blades, cutting parts and wear-loaded mechanical components
- Hydraulic and general mechanical-engineering components
- Automotive, energy and industrial-equipment parts
- Special components requiring hardenability and moderate corrosion resistance
Availability and Certification Note
For X20Cr13 / 1.4021, stock diameter, length, surface condition, delivery condition and available EN 10204 certification must be confirmed during quotation. Certificate values apply only to the relevant heat or lot.
For food, medical, pressure, seawater or high-chloride applications, material selection must not be made until the relevant product standard, surface condition, certification and service suitability have been verified.